drm: remove redundant code form drm_ioc32.c
The compat ioctl handler ends up calling access_ok() twice: first indirectly inside compat_alloc_user_space() and then after returning from that function. This patch fixes issue. v2: there were three invalid removals of access_ok() that I've fixed. Also went through all the changes couple of times and verified that access_ok() is only removed when the buffer is allocated with compat_alloc_user_space(). My deepest apologies for this kind of sloppiness! Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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@ -93,7 +93,7 @@ static int compat_drm_version(struct file *file, unsigned int cmd,
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return -EFAULT;
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version = compat_alloc_user_space(sizeof(*version));
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if (!access_ok(VERIFY_WRITE, version, sizeof(*version)))
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if (!version)
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return -EFAULT;
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if (__put_user(v32.name_len, &version->name_len)
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|| __put_user((void __user *)(unsigned long)v32.name,
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@ -140,7 +140,7 @@ static int compat_drm_getunique(struct file *file, unsigned int cmd,
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return -EFAULT;
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u = compat_alloc_user_space(sizeof(*u));
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if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
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if (!u)
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return -EFAULT;
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if (__put_user(uq32.unique_len, &u->unique_len)
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|| __put_user((void __user *)(unsigned long)uq32.unique,
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@ -168,7 +168,7 @@ static int compat_drm_setunique(struct file *file, unsigned int cmd,
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return -EFAULT;
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u = compat_alloc_user_space(sizeof(*u));
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if (!access_ok(VERIFY_WRITE, u, sizeof(*u)))
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if (!u)
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return -EFAULT;
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if (__put_user(uq32.unique_len, &u->unique_len)
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|| __put_user((void __user *)(unsigned long)uq32.unique,
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@ -200,7 +200,7 @@ static int compat_drm_getmap(struct file *file, unsigned int cmd,
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return -EFAULT;
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map = compat_alloc_user_space(sizeof(*map));
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if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
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if (!map)
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return -EFAULT;
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if (__put_user(idx, &map->offset))
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return -EFAULT;
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@ -237,7 +237,7 @@ static int compat_drm_addmap(struct file *file, unsigned int cmd,
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return -EFAULT;
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map = compat_alloc_user_space(sizeof(*map));
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if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
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if (!map)
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return -EFAULT;
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if (__put_user(m32.offset, &map->offset)
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|| __put_user(m32.size, &map->size)
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@ -277,7 +277,7 @@ static int compat_drm_rmmap(struct file *file, unsigned int cmd,
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return -EFAULT;
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map = compat_alloc_user_space(sizeof(*map));
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if (!access_ok(VERIFY_WRITE, map, sizeof(*map)))
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if (!map)
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return -EFAULT;
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if (__put_user((void *)(unsigned long)handle, &map->handle))
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return -EFAULT;
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@ -306,7 +306,7 @@ static int compat_drm_getclient(struct file *file, unsigned int cmd,
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return -EFAULT;
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client = compat_alloc_user_space(sizeof(*client));
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if (!access_ok(VERIFY_WRITE, client, sizeof(*client)))
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if (!client)
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return -EFAULT;
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if (__put_user(idx, &client->idx))
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return -EFAULT;
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@ -345,7 +345,7 @@ static int compat_drm_getstats(struct file *file, unsigned int cmd,
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int i, err;
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stats = compat_alloc_user_space(sizeof(*stats));
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if (!access_ok(VERIFY_WRITE, stats, sizeof(*stats)))
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if (!stats)
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return -EFAULT;
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err = drm_ioctl(file, DRM_IOCTL_GET_STATS, (unsigned long)stats);
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@ -382,8 +382,7 @@ static int compat_drm_addbufs(struct file *file, unsigned int cmd,
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unsigned long agp_start;
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buf = compat_alloc_user_space(sizeof(*buf));
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if (!access_ok(VERIFY_WRITE, buf, sizeof(*buf))
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|| !access_ok(VERIFY_WRITE, argp, sizeof(*argp)))
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if (!buf || !access_ok(VERIFY_WRITE, argp, sizeof(*argp)))
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return -EFAULT;
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if (__copy_in_user(buf, argp, offsetof(drm_buf_desc32_t, agp_start))
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@ -414,7 +413,7 @@ static int compat_drm_markbufs(struct file *file, unsigned int cmd,
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return -EFAULT;
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buf = compat_alloc_user_space(sizeof(*buf));
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if (!access_ok(VERIFY_WRITE, buf, sizeof(*buf)))
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if (!buf)
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return -EFAULT;
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if (__put_user(b32.size, &buf->size)
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@ -455,7 +454,7 @@ static int compat_drm_infobufs(struct file *file, unsigned int cmd,
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nbytes = sizeof(*request) + count * sizeof(struct drm_buf_desc);
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request = compat_alloc_user_space(nbytes);
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if (!access_ok(VERIFY_WRITE, request, nbytes))
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if (!request)
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return -EFAULT;
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list = (struct drm_buf_desc *) (request + 1);
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@ -516,7 +515,7 @@ static int compat_drm_mapbufs(struct file *file, unsigned int cmd,
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return -EINVAL;
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nbytes = sizeof(*request) + count * sizeof(struct drm_buf_pub);
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request = compat_alloc_user_space(nbytes);
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if (!access_ok(VERIFY_WRITE, request, nbytes))
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if (!request)
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return -EFAULT;
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list = (struct drm_buf_pub *) (request + 1);
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@ -563,7 +562,7 @@ static int compat_drm_freebufs(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
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if (!request)
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return -EFAULT;
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if (__put_user(req32.count, &request->count)
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|| __put_user((int __user *)(unsigned long)req32.list,
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@ -589,7 +588,7 @@ static int compat_drm_setsareactx(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
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if (!request)
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return -EFAULT;
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if (__put_user(req32.ctx_id, &request->ctx_id)
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|| __put_user((void *)(unsigned long)req32.handle,
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@ -613,7 +612,7 @@ static int compat_drm_getsareactx(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request)))
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if (!request)
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return -EFAULT;
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if (__put_user(ctx_id, &request->ctx_id))
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return -EFAULT;
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@ -646,7 +645,7 @@ static int compat_drm_resctx(struct file *file, unsigned int cmd,
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return -EFAULT;
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res = compat_alloc_user_space(sizeof(*res));
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if (!access_ok(VERIFY_WRITE, res, sizeof(*res)))
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if (!res)
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return -EFAULT;
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if (__put_user(res32.count, &res->count)
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|| __put_user((struct drm_ctx __user *) (unsigned long)res32.contexts,
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@ -689,7 +688,7 @@ static int compat_drm_dma(struct file *file, unsigned int cmd,
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return -EFAULT;
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d = compat_alloc_user_space(sizeof(*d));
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if (!access_ok(VERIFY_WRITE, d, sizeof(*d)))
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if (!d)
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return -EFAULT;
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if (__put_user(d32.context, &d->context)
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@ -764,7 +763,7 @@ static int compat_drm_agp_info(struct file *file, unsigned int cmd,
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int err;
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info = compat_alloc_user_space(sizeof(*info));
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if (!access_ok(VERIFY_WRITE, info, sizeof(*info)))
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if (!info)
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return -EFAULT;
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err = drm_ioctl(file, DRM_IOCTL_AGP_INFO, (unsigned long)info);
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@ -807,7 +806,7 @@ static int compat_drm_agp_alloc(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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if (!request
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|| __put_user(req32.size, &request->size)
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|| __put_user(req32.type, &request->type))
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return -EFAULT;
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@ -834,7 +833,7 @@ static int compat_drm_agp_free(struct file *file, unsigned int cmd,
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u32 handle;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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if (!request
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|| get_user(handle, &argp->handle)
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|| __put_user(handle, &request->handle))
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return -EFAULT;
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@ -858,7 +857,7 @@ static int compat_drm_agp_bind(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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if (!request
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|| __put_user(req32.handle, &request->handle)
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|| __put_user(req32.offset, &request->offset))
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return -EFAULT;
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@ -874,7 +873,7 @@ static int compat_drm_agp_unbind(struct file *file, unsigned int cmd,
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u32 handle;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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if (!request
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|| get_user(handle, &argp->handle)
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|| __put_user(handle, &request->handle))
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return -EFAULT;
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@ -897,8 +896,7 @@ static int compat_drm_sg_alloc(struct file *file, unsigned int cmd,
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unsigned long x;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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|| !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
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if (!request || !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
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|| __get_user(x, &argp->size)
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|| __put_user(x, &request->size))
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return -EFAULT;
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@ -923,8 +921,7 @@ static int compat_drm_sg_free(struct file *file, unsigned int cmd,
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unsigned long x;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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|| !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
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if (!request || !access_ok(VERIFY_WRITE, argp, sizeof(*argp))
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|| __get_user(x, &argp->handle)
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|| __put_user(x << PAGE_SHIFT, &request->handle))
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return -EFAULT;
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@ -952,7 +949,7 @@ static int compat_drm_update_draw(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request)) ||
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if (!request ||
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__put_user(update32.handle, &request->handle) ||
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__put_user(update32.type, &request->type) ||
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__put_user(update32.num, &request->num) ||
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@ -994,7 +991,7 @@ static int compat_drm_wait_vblank(struct file *file, unsigned int cmd,
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return -EFAULT;
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request = compat_alloc_user_space(sizeof(*request));
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if (!access_ok(VERIFY_WRITE, request, sizeof(*request))
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if (!request
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|| __put_user(req32.request.type, &request->request.type)
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|| __put_user(req32.request.sequence, &request->request.sequence)
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|| __put_user(req32.request.signal, &request->request.signal))
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