Heuristic that checks if the memory pointer has been changed lacked a check
if the pointer was actually provided by the userspace, what allowed one to
queue a NULL pointer which was accepted without further checking. This
patch fixes this issue.
Reported-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
CC: Pawel Osciak <pawel@xxxxxxxxxx>
---
drivers/media/video/videobuf2-core.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index ec49fed..24f11ae 100644
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -765,7 +765,8 @@ static int __qbuf_userptr(struct vb2_buffer *vb, struct v4l2_buffer *b)
for (plane = 0; plane < vb->num_planes; ++plane) {
/* Skip the plane if already verified */
- if (vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr
+ if (vb->v4l2_planes[plane].m.userptr &&
+ vb->v4l2_planes[plane].m.userptr == planes[plane].m.userptr
&& vb->v4l2_planes[plane].length == planes[plane].length)
continue;
--
1.7.1.569.g6f426
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