[media] vb2: Check if there are buffers before streamon

This patch adds a test preventing streamon() if there is no buffer
ready.

Without this patch, a user could call streamon() before
preparing any buffer. This leads to a situation where if he calls
close() before calling streamoff() the device is kept streaming.

Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 8e6695c9b0e22369bcc7e6a82690136a0ee0ed12..3c07534e9ba53234c473149d6070c44df432004c 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1832,6 +1832,11 @@ static int vb2_internal_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
                return -EINVAL;
        }
 
+       if (!q->num_buffers) {
+               dprintk(1, "streamon: no buffers have been allocated\n");
+               return -EINVAL;
+       }
+
        /*
         * If any buffers were queued before streamon,
         * we can now pass them to driver for processing.