![Dan Carpenter](/assets/img/avatar_default.png)
The last part of the "u_ent.name" buffer isn't cleared so it still has uninitialized stack memory. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
464 lines
11 KiB
C
464 lines
11 KiB
C
/*
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* Media device
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*
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* Copyright (C) 2010 Nokia Corporation
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*
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* Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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* Sakari Ailus <sakari.ailus@iki.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/compat.h>
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#include <linux/export.h>
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#include <linux/ioctl.h>
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#include <linux/media.h>
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#include <linux/types.h>
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#include <media/media-device.h>
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#include <media/media-devnode.h>
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#include <media/media-entity.h>
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/* -----------------------------------------------------------------------------
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* Userspace API
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*/
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static int media_device_open(struct file *filp)
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{
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return 0;
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}
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static int media_device_close(struct file *filp)
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{
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return 0;
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}
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static int media_device_get_info(struct media_device *dev,
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struct media_device_info __user *__info)
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{
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struct media_device_info info;
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memset(&info, 0, sizeof(info));
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strlcpy(info.driver, dev->dev->driver->name, sizeof(info.driver));
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strlcpy(info.model, dev->model, sizeof(info.model));
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strlcpy(info.serial, dev->serial, sizeof(info.serial));
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strlcpy(info.bus_info, dev->bus_info, sizeof(info.bus_info));
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info.media_version = MEDIA_API_VERSION;
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info.hw_revision = dev->hw_revision;
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info.driver_version = dev->driver_version;
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if (copy_to_user(__info, &info, sizeof(*__info)))
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return -EFAULT;
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return 0;
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}
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static struct media_entity *find_entity(struct media_device *mdev, u32 id)
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{
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struct media_entity *entity;
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int next = id & MEDIA_ENT_ID_FLAG_NEXT;
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id &= ~MEDIA_ENT_ID_FLAG_NEXT;
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spin_lock(&mdev->lock);
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media_device_for_each_entity(entity, mdev) {
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if ((entity->id == id && !next) ||
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(entity->id > id && next)) {
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spin_unlock(&mdev->lock);
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return entity;
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}
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}
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spin_unlock(&mdev->lock);
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return NULL;
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}
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static long media_device_enum_entities(struct media_device *mdev,
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struct media_entity_desc __user *uent)
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{
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struct media_entity *ent;
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struct media_entity_desc u_ent;
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if (copy_from_user(&u_ent.id, &uent->id, sizeof(u_ent.id)))
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return -EFAULT;
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ent = find_entity(mdev, u_ent.id);
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if (ent == NULL)
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return -EINVAL;
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u_ent.id = ent->id;
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if (ent->name) {
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strncpy(u_ent.name, ent->name, sizeof(u_ent.name));
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u_ent.name[sizeof(u_ent.name) - 1] = '\0';
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} else {
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memset(u_ent.name, 0, sizeof(u_ent.name));
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}
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u_ent.type = ent->type;
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u_ent.revision = ent->revision;
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u_ent.flags = ent->flags;
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u_ent.group_id = ent->group_id;
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u_ent.pads = ent->num_pads;
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u_ent.links = ent->num_links - ent->num_backlinks;
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memcpy(&u_ent.raw, &ent->info, sizeof(ent->info));
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if (copy_to_user(uent, &u_ent, sizeof(u_ent)))
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return -EFAULT;
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return 0;
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}
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static void media_device_kpad_to_upad(const struct media_pad *kpad,
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struct media_pad_desc *upad)
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{
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upad->entity = kpad->entity->id;
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upad->index = kpad->index;
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upad->flags = kpad->flags;
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}
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static long __media_device_enum_links(struct media_device *mdev,
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struct media_links_enum *links)
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{
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struct media_entity *entity;
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entity = find_entity(mdev, links->entity);
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if (entity == NULL)
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return -EINVAL;
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if (links->pads) {
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unsigned int p;
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for (p = 0; p < entity->num_pads; p++) {
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struct media_pad_desc pad;
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media_device_kpad_to_upad(&entity->pads[p], &pad);
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if (copy_to_user(&links->pads[p], &pad, sizeof(pad)))
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return -EFAULT;
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}
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}
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if (links->links) {
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struct media_link_desc __user *ulink;
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unsigned int l;
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for (l = 0, ulink = links->links; l < entity->num_links; l++) {
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struct media_link_desc link;
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/* Ignore backlinks. */
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if (entity->links[l].source->entity != entity)
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continue;
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media_device_kpad_to_upad(entity->links[l].source,
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&link.source);
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media_device_kpad_to_upad(entity->links[l].sink,
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&link.sink);
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link.flags = entity->links[l].flags;
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if (copy_to_user(ulink, &link, sizeof(*ulink)))
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return -EFAULT;
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ulink++;
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}
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}
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return 0;
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}
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static long media_device_enum_links(struct media_device *mdev,
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struct media_links_enum __user *ulinks)
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{
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struct media_links_enum links;
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int rval;
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if (copy_from_user(&links, ulinks, sizeof(links)))
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return -EFAULT;
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rval = __media_device_enum_links(mdev, &links);
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if (rval < 0)
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return rval;
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if (copy_to_user(ulinks, &links, sizeof(*ulinks)))
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return -EFAULT;
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return 0;
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}
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static long media_device_setup_link(struct media_device *mdev,
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struct media_link_desc __user *_ulink)
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{
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struct media_link *link = NULL;
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struct media_link_desc ulink;
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struct media_entity *source;
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struct media_entity *sink;
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int ret;
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if (copy_from_user(&ulink, _ulink, sizeof(ulink)))
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return -EFAULT;
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/* Find the source and sink entities and link.
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*/
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source = find_entity(mdev, ulink.source.entity);
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sink = find_entity(mdev, ulink.sink.entity);
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if (source == NULL || sink == NULL)
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return -EINVAL;
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if (ulink.source.index >= source->num_pads ||
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ulink.sink.index >= sink->num_pads)
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return -EINVAL;
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link = media_entity_find_link(&source->pads[ulink.source.index],
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&sink->pads[ulink.sink.index]);
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if (link == NULL)
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return -EINVAL;
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/* Setup the link on both entities. */
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ret = __media_entity_setup_link(link, ulink.flags);
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if (copy_to_user(_ulink, &ulink, sizeof(ulink)))
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return -EFAULT;
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return ret;
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}
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static long media_device_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct media_devnode *devnode = media_devnode_data(filp);
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struct media_device *dev = to_media_device(devnode);
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long ret;
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switch (cmd) {
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case MEDIA_IOC_DEVICE_INFO:
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ret = media_device_get_info(dev,
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(struct media_device_info __user *)arg);
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break;
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case MEDIA_IOC_ENUM_ENTITIES:
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ret = media_device_enum_entities(dev,
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(struct media_entity_desc __user *)arg);
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break;
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case MEDIA_IOC_ENUM_LINKS:
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mutex_lock(&dev->graph_mutex);
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ret = media_device_enum_links(dev,
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(struct media_links_enum __user *)arg);
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mutex_unlock(&dev->graph_mutex);
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break;
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case MEDIA_IOC_SETUP_LINK:
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mutex_lock(&dev->graph_mutex);
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ret = media_device_setup_link(dev,
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(struct media_link_desc __user *)arg);
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mutex_unlock(&dev->graph_mutex);
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break;
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default:
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ret = -ENOIOCTLCMD;
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}
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return ret;
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}
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#ifdef CONFIG_COMPAT
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struct media_links_enum32 {
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__u32 entity;
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compat_uptr_t pads; /* struct media_pad_desc * */
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compat_uptr_t links; /* struct media_link_desc * */
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__u32 reserved[4];
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};
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static long media_device_enum_links32(struct media_device *mdev,
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struct media_links_enum32 __user *ulinks)
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{
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struct media_links_enum links;
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compat_uptr_t pads_ptr, links_ptr;
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memset(&links, 0, sizeof(links));
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if (get_user(links.entity, &ulinks->entity)
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|| get_user(pads_ptr, &ulinks->pads)
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|| get_user(links_ptr, &ulinks->links))
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return -EFAULT;
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links.pads = compat_ptr(pads_ptr);
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links.links = compat_ptr(links_ptr);
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return __media_device_enum_links(mdev, &links);
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}
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#define MEDIA_IOC_ENUM_LINKS32 _IOWR('|', 0x02, struct media_links_enum32)
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static long media_device_compat_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct media_devnode *devnode = media_devnode_data(filp);
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struct media_device *dev = to_media_device(devnode);
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long ret;
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switch (cmd) {
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case MEDIA_IOC_DEVICE_INFO:
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case MEDIA_IOC_ENUM_ENTITIES:
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case MEDIA_IOC_SETUP_LINK:
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return media_device_ioctl(filp, cmd, arg);
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case MEDIA_IOC_ENUM_LINKS32:
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mutex_lock(&dev->graph_mutex);
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ret = media_device_enum_links32(dev,
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(struct media_links_enum32 __user *)arg);
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mutex_unlock(&dev->graph_mutex);
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break;
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default:
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ret = -ENOIOCTLCMD;
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}
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return ret;
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}
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#endif /* CONFIG_COMPAT */
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static const struct media_file_operations media_device_fops = {
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.owner = THIS_MODULE,
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.open = media_device_open,
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.ioctl = media_device_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = media_device_compat_ioctl,
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#endif /* CONFIG_COMPAT */
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.release = media_device_close,
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};
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/* -----------------------------------------------------------------------------
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* sysfs
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*/
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static ssize_t show_model(struct device *cd,
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struct device_attribute *attr, char *buf)
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{
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struct media_device *mdev = to_media_device(to_media_devnode(cd));
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return sprintf(buf, "%.*s\n", (int)sizeof(mdev->model), mdev->model);
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}
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static DEVICE_ATTR(model, S_IRUGO, show_model, NULL);
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/* -----------------------------------------------------------------------------
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* Registration/unregistration
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*/
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static void media_device_release(struct media_devnode *mdev)
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{
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}
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/**
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* media_device_register - register a media device
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* @mdev: The media device
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*
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* The caller is responsible for initializing the media device before
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* registration. The following fields must be set:
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*
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* - dev must point to the parent device
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* - model must be filled with the device model name
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*/
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int __must_check media_device_register(struct media_device *mdev)
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{
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int ret;
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if (WARN_ON(mdev->dev == NULL || mdev->model[0] == 0))
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return -EINVAL;
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mdev->entity_id = 1;
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INIT_LIST_HEAD(&mdev->entities);
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spin_lock_init(&mdev->lock);
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mutex_init(&mdev->graph_mutex);
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/* Register the device node. */
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mdev->devnode.fops = &media_device_fops;
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mdev->devnode.parent = mdev->dev;
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mdev->devnode.release = media_device_release;
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ret = media_devnode_register(&mdev->devnode);
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if (ret < 0)
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return ret;
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ret = device_create_file(&mdev->devnode.dev, &dev_attr_model);
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if (ret < 0) {
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media_devnode_unregister(&mdev->devnode);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_device_register);
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/**
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* media_device_unregister - unregister a media device
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* @mdev: The media device
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*
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*/
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void media_device_unregister(struct media_device *mdev)
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{
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struct media_entity *entity;
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struct media_entity *next;
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list_for_each_entry_safe(entity, next, &mdev->entities, list)
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media_device_unregister_entity(entity);
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device_remove_file(&mdev->devnode.dev, &dev_attr_model);
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media_devnode_unregister(&mdev->devnode);
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}
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EXPORT_SYMBOL_GPL(media_device_unregister);
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/**
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* media_device_register_entity - Register an entity with a media device
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* @mdev: The media device
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* @entity: The entity
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*/
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int __must_check media_device_register_entity(struct media_device *mdev,
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struct media_entity *entity)
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{
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/* Warn if we apparently re-register an entity */
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WARN_ON(entity->parent != NULL);
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entity->parent = mdev;
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spin_lock(&mdev->lock);
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if (entity->id == 0)
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entity->id = mdev->entity_id++;
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else
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mdev->entity_id = max(entity->id + 1, mdev->entity_id);
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list_add_tail(&entity->list, &mdev->entities);
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spin_unlock(&mdev->lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(media_device_register_entity);
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/**
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* media_device_unregister_entity - Unregister an entity
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* @entity: The entity
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*
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* If the entity has never been registered this function will return
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* immediately.
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*/
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void media_device_unregister_entity(struct media_entity *entity)
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{
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struct media_device *mdev = entity->parent;
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if (mdev == NULL)
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return;
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spin_lock(&mdev->lock);
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list_del(&entity->list);
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spin_unlock(&mdev->lock);
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entity->parent = NULL;
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}
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EXPORT_SYMBOL_GPL(media_device_unregister_entity);
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