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[media] videobuf2-core: Check user space planes array in dqbuf

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The number of planes in videobuf2 is specific to a buffer. In order to
verify that the planes array provided by the user is long enough, a new
vb2_buf_op is required.

Call __verify_planes_array() when the dequeued buffer is known. Return an
error to the caller if there was one, otherwise remove the buffer from the
done list.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: stable@vger.kernel.org # for v4.4 and later
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Sakari Ailus 2016-04-03 16:15:00 -03:00 committed by Mauro Carvalho Chehab
parent 405ddbfa68
commit e7e0c3e265
2 changed files with 9 additions and 5 deletions
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10
drivers/media/v4l2-core/videobuf2-core.c
View file

@ -1645,7 +1645,7 @@ static int __vb2_wait_for_done_vb(struct vb2_queue *q, int nonblocking)
* Will sleep if required for nonblocking == false.
*/
static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb,
int nonblocking)
void *pb, int nonblocking)
{
unsigned long flags;
int ret;
@ -1666,10 +1666,10 @@ static int __vb2_get_done_vb(struct vb2_queue *q, struct vb2_buffer **vb,
/*
* Only remove the buffer from done_list if v4l2_buffer can handle all
* the planes.
* Verifying planes is NOT necessary since it already has been checked
* before the buffer is queued/prepared. So it can never fail.
*/
list_del(&(*vb)->done_entry);
ret = call_bufop(q, verify_planes_array, *vb, pb);
if (!ret)
list_del(&(*vb)->done_entry);
spin_unlock_irqrestore(&q->done_lock, flags);
return ret;
@ -1748,7 +1748,7 @@ int vb2_core_dqbuf(struct vb2_queue *q, unsigned int *pindex, void *pb,
struct vb2_buffer *vb = NULL;
int ret;
ret = __vb2_get_done_vb(q, &vb, nonblocking);
ret = __vb2_get_done_vb(q, &vb, pb, nonblocking);
if (ret < 0)
return ret;

4
include/media/videobuf2-core.h
View file

@ -375,6 +375,9 @@ struct vb2_ops {
/**
* struct vb2_ops - driver-specific callbacks
*
* @verify_planes_array: Verify that a given user space structure contains
* enough planes for the buffer. This is called
* for each dequeued buffer.
* @fill_user_buffer: given a vb2_buffer fill in the userspace structure.
* For V4L2 this is a struct v4l2_buffer.
* @fill_vb2_buffer: given a userspace structure, fill in the vb2_buffer.
@ -384,6 +387,7 @@ struct vb2_ops {
* the vb2_buffer struct.
*/
struct vb2_buf_ops {
int (*verify_planes_array)(struct vb2_buffer *vb, const void *pb);
void (*fill_user_buffer)(struct vb2_buffer *vb, void *pb);
int (*fill_vb2_buffer)(struct vb2_buffer *vb, const void *pb,
struct vb2_plane *planes);