[media] vb2: Fix an off by one error in 'vb2_plane_vaddr'

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")
Cc: stable@vger.kernel.org
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>

diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 94afbbf928072ba6c24c850bdc41c3ab0820a96d..c0175ea7e7ad186d7d62c352c917cb3d14e28649 100644 (file)
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -868,7 +868,7 @@ EXPORT_SYMBOL_GPL(vb2_core_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);