diff options
| author | Laurent Pinchart <laurent.pinchart@skynet.be> | 2009-06-04 09:26:39 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-06-16 19:07:30 -0300 |
| commit | 23ff6043add670713bbf2f6ee5d520459cfdfae9 (patch) | |
| tree | b275b1baf5e1f9940b27e388784ed999ab1c6e93 | |
| parent | d732c44c1a4b54e3c59ad92069bc2fd848aca5f3 (diff) | |
V4L/DVB (11945): uvcvideo: Don't accept to change the format when buffers are allocated.
Setting a new frame format or size will likely change the buffer size required
to store a complete video frame. To avoid a buffer overflow, don't allow
VIDIOC_S_FMT calls when video buffers are already allocated.
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
| -rw-r--r-- | drivers/media/video/uvc/uvc_queue.c | 14 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_v4l2.c | 2 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvcvideo.h | 1 |
3 files changed, 16 insertions, 1 deletions
diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c index 0155752e4a5..f854698c406 100644 --- a/drivers/media/video/uvc/uvc_queue.c +++ b/drivers/media/video/uvc/uvc_queue.c @@ -172,6 +172,20 @@ int uvc_free_buffers(struct uvc_video_queue *queue) return 0; } +/* + * Check if buffers have been allocated. + */ +int uvc_queue_allocated(struct uvc_video_queue *queue) +{ + int allocated; + + mutex_lock(&queue->mutex); + allocated = queue->count != 0; + mutex_unlock(&queue->mutex); + + return allocated; +} + static void __uvc_query_buffer(struct uvc_buffer *buf, struct v4l2_buffer *v4l2_buf) { diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index 507542dcbda..f8b94d608a1 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -251,7 +251,7 @@ static int uvc_v4l2_set_format(struct uvc_video_device *video, if (fmt->type != video->streaming->type) return -EINVAL; - if (uvc_queue_streaming(&video->queue)) + if (uvc_queue_allocated(&video->queue)) return -EBUSY; ret = uvc_v4l2_try_format(video, fmt, &probe, &format, &frame); diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index f435e8eeccd..3c78d3c1e4c 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -747,6 +747,7 @@ extern struct uvc_buffer *uvc_queue_next_buffer(struct uvc_video_queue *queue, struct uvc_buffer *buf); extern unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file, poll_table *wait); +extern int uvc_queue_allocated(struct uvc_video_queue *queue); static inline int uvc_queue_streaming(struct uvc_video_queue *queue) { return queue->flags & UVC_QUEUE_STREAMING; |