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ALSA: usb-audio: Sanity checks for each pipe and EP types 

The recent USB core code performs sanity checks for the given pipe and
EP types, and it can be hit by manipulated USB descriptors by syzbot.
For making syzbot happier, this patch introduces a local helper for a
sanity check in the driver side and calls it at each place before the
message handling, so that we can avoid the WARNING splats.

Reported-by: syzbot+d952e5e28f5fb7718d23@syzkaller.appspotmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
alistair/sunxi64-5.4-dsi
Takashi Iwai 2019-06-24 15:08:28 +02:00
parent c5dfd4b885
commit 801ebf1043
3 changed files with 33 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
sound/usb/helper.c
View File

@ -76,6 +76,20 @@ void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype
return NULL;
}
/* check the validity of pipe and EP types */
int snd_usb_pipe_sanity_check(struct usb_device *dev, unsigned int pipe)
{
static const int pipetypes[4] = {
PIPE_CONTROL, PIPE_ISOCHRONOUS, PIPE_BULK, PIPE_INTERRUPT
};
struct usb_host_endpoint *ep;
ep = usb_pipe_endpoint(dev, pipe);
if (usb_pipetype(pipe) != pipetypes[usb_endpoint_type(&ep->desc)])
return -EINVAL;
return 0;
}
/*
* Wrapper for usb_control_msg().
* Allocates a temp buffer to prevent dmaing from/to the stack.
@ -88,6 +102,9 @@ int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe, __u8 request,
void *buf = NULL;
int timeout;
if (snd_usb_pipe_sanity_check(dev, pipe))
return -EINVAL;
if (size > 0) {
buf = kmemdup(data, size, GFP_KERNEL);
if (!buf)

1
sound/usb/helper.h
View File

@ -7,6 +7,7 @@ unsigned int snd_usb_combine_bytes(unsigned char *bytes, int size);
void *snd_usb_find_desc(void *descstart, int desclen, void *after, u8 dtype);
void *snd_usb_find_csint_desc(void *descstart, int desclen, void *after, u8 dsubtype);
int snd_usb_pipe_sanity_check(struct usb_device *dev, unsigned int pipe);
int snd_usb_ctl_msg(struct usb_device *dev, unsigned int pipe,
__u8 request, __u8 requesttype, __u16 value, __u16 index,
void *data, __u16 size);

18
sound/usb/quirks.c
View File

@ -840,11 +840,13 @@ static int snd_usb_novation_boot_quirk(struct usb_device *dev)
static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
{
int err, actual_length;
/* "midi send" enable */
static const u8 seq[] = { 0x4e, 0x73, 0x52, 0x01 };
void *buf;
void *buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
if (snd_usb_pipe_sanity_check(dev, usb_sndintpipe(dev, 0x05)))
return -EINVAL;
buf = kmemdup(seq, ARRAY_SIZE(seq), GFP_KERNEL);
if (!buf)
return -ENOMEM;
err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x05), buf,
@ -869,7 +871,11 @@ static int snd_usb_accessmusic_boot_quirk(struct usb_device *dev)
static int snd_usb_nativeinstruments_boot_quirk(struct usb_device *dev)
{
int ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
int ret;
if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
return -EINVAL;
ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
0xaf, USB_TYPE_VENDOR | USB_RECIP_DEVICE,
1, 0, NULL, 0, 1000);
@ -976,6 +982,8 @@ static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
dev_dbg(&dev->dev, "Waiting for Axe-Fx III to boot up...\n");
if (snd_usb_pipe_sanity_check(dev, usb_sndctrlpipe(dev, 0)))
return -EINVAL;
/* If the Axe-Fx III has not fully booted, it will timeout when trying
* to enable the audio streaming interface. A more generous timeout is
* used here to detect when the Axe-Fx III has finished booting as the
@ -1008,6 +1016,8 @@ static int snd_usb_motu_microbookii_communicate(struct usb_device *dev, u8 *buf,
{
int err, actual_length;
if (snd_usb_pipe_sanity_check(dev, usb_sndintpipe(dev, 0x01)))
return -EINVAL;
err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x01), buf, *length,
&actual_length, 1000);
if (err < 0)
@ -1018,6 +1028,8 @@ static int snd_usb_motu_microbookii_communicate(struct usb_device *dev, u8 *buf,
memset(buf, 0, buf_size);
if (snd_usb_pipe_sanity_check(dev, usb_rcvintpipe(dev, 0x82)))
return -EINVAL;
err = usb_interrupt_msg(dev, usb_rcvintpipe(dev, 0x82), buf, buf_size,
&actual_length, 1000);
if (err < 0)