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[PATCH 3.16 122/233] [media] vb2: Fix an off by one error in 'vb2_plane_vaddr'

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  [PATCH 3.16 122/233] [media] vb2: Fix an off by one error in  'vb2_plane_vaddr' Ben Hutchings <ben@decadent.org.uk> - 2017-09-10 01:10 +0200

#1729738 — [PATCH 3.16 122/233] [media] vb2: Fix an off by one error in 'vb2_plane_vaddr'

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

commit 5ebb6dd36c9f5fb37b1077b393c254d70a14cb46 upstream.

We should ensure that 'plane_no' is '< vb->num_planes' as done in
'vb2_plane_cookie' just a few lines below.

Fixes: e23ccc0ad925 ("[media] v4l: add videobuf2 Video for Linux 2 driver framework")

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/media/v4l2-core/videobuf2-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -1107,7 +1107,7 @@ EXPORT_SYMBOL_GPL(vb2_create_bufs);
  */
 void *vb2_plane_vaddr(struct vb2_buffer *vb, unsigned int plane_no)
 {
-	if (plane_no > vb->num_planes || !vb->planes[plane_no].mem_priv)
+	if (plane_no >= vb->num_planes || !vb->planes[plane_no].mem_priv)
 		return NULL;
 
 	return call_ptr_memop(vb, vaddr, vb->planes[plane_no].mem_priv);

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