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Subject: media: videobuf2-core: Prevent size alignment wrapping buffer size to 0 Author: Sakari Ailus sakari.ailus@linux.intel.com Date: Wed Dec 12 07:27:10 2018 -0500

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@linux.intel.com Cc: stable@vger.kernel.org Reviewed-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/media/common/videobuf2/videobuf2-core.c | 4 ++++ 1 file changed, 4 insertions(+)

---

diff --git a/drivers/media/common/videobuf2/videobuf2-core.c b/drivers/media/common/videobuf2/videobuf2-core.c index 3cf25abf5807..cfccee87909a 100644 --- 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 vb2_buffer *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);