From: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
commit defcdc5d89ced780fb45196d539d6570ec5b1ba5 upstream.
PAGE_ALIGN() may wrap the buffer size around to 0. Prevent this by
checking that the aligned value is not smaller than the unaligned one.
Note on backporting to stable: the file used to be under
drivers/media/v4l2-core, it was moved to the current location after 4.14.
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/common/videobuf2/videobuf2-core.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/media/common/videobuf2/videobuf2-core.c
+++ b/drivers/media/common/videobuf2/videobuf2-core.c
@@ -207,6 +207,10 @@ static int __vb2_buf_mem_alloc(struct vb
for (plane = 0; plane < vb->num_planes; ++plane) {
unsigned long size = PAGE_ALIGN(vb->planes[plane].length);
+ /* Did it wrap around? */
+ if (size < vb->planes[plane].length)
+ goto free;
+
mem_priv = call_ptr_memop(vb, alloc,
q->alloc_devs[plane] ? : q->dev,
q->dma_attrs, size, q->dma_dir, q->gfp_flags);
