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media: uvcvideo: Also validate buffers in BULK mode

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Just like for ISOC, validate the decoded BULK buffer size when possible.
This avoids sending corrupted or partial buffers to userspace, which may
lead to application crash or run-time failure.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
[laurent.pinchart@ideasonboard.com: Move uvc_video_validate_buffer() call to uvc_video_next_buffers()]
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Nicolas Dufresne 2018-06-04 20:24:15 -04:00 committed by Mauro Carvalho Chehab
parent 557a5c7fe6
commit 95f5cbff90
1 changed files with 4 additions and 6 deletions
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10
drivers/media/usb/uvc/uvc_video.c
View file

@ -1232,6 +1232,8 @@ static void uvc_video_validate_buffer(const struct uvc_streaming *stream,
static void uvc_video_next_buffers(struct uvc_streaming *stream,
struct uvc_buffer **video_buf, struct uvc_buffer **meta_buf)
{
uvc_video_validate_buffer(stream, *video_buf);
if (*meta_buf) {
struct vb2_v4l2_buffer *vb2_meta = &(*meta_buf)->buf;
const struct vb2_v4l2_buffer *vb2_video = &(*video_buf)->buf;
@ -1270,10 +1272,8 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
do {
ret = uvc_video_decode_start(stream, buf, mem,
urb->iso_frame_desc[i].actual_length);
if (ret == -EAGAIN) {
uvc_video_validate_buffer(stream, buf);
if (ret == -EAGAIN)
uvc_video_next_buffers(stream, &buf, &meta_buf);
}
} while (ret == -EAGAIN);
if (ret < 0)
@ -1289,10 +1289,8 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
uvc_video_decode_end(stream, buf, mem,
urb->iso_frame_desc[i].actual_length);
if (buf->state == UVC_BUF_STATE_READY) {
uvc_video_validate_buffer(stream, buf);
if (buf->state == UVC_BUF_STATE_READY)
uvc_video_next_buffers(stream, &buf, &meta_buf);
}
}
}