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Subject: media: videobuf2-dma-sg: Prevent size from overflowing Author: Sakari Ailus sakari.ailus@linux.intel.com Date: Wed Dec 12 07:44:14 2018 -0500
buf->size is an unsigned long; casting that to int will lead to an overflow if buf->size exceeds INT_MAX.
Fix this by changing the type to unsigned long instead. This is possible as the buf->size is always aligned to PAGE_SIZE, and therefore the size will never have values lesser than 0.
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-dma-sg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/drivers/media/common/videobuf2/videobuf2-dma-sg.c b/drivers/media/common/videobuf2/videobuf2-dma-sg.c index 4a4c49d6085c..0f06f08346ba 100644 --- a/drivers/media/common/videobuf2/videobuf2-dma-sg.c +++ b/drivers/media/common/videobuf2/videobuf2-dma-sg.c @@ -59,7 +59,7 @@ static int vb2_dma_sg_alloc_compacted(struct vb2_dma_sg_buf *buf, gfp_t gfp_flags) { unsigned int last_page = 0; - int size = buf->size; + unsigned long size = buf->size;
while (size > 0) { struct page *pages;