[PATCH 6.4 568/800] media: common: saa7146: Avoid a leak in vmalloc_to_sg()

Greg Kroah-Hartman
2023-07-16T20:20:45Z

From: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

[ Upstream commit b2aa8ac6f97e26d788948fb60dcc5625c9633f4e ]

Commit in Fixes turned a BUG() into a "normal" memory allocation failure.
While at it, it introduced a memory leak.
So fix it.

Also update the comment on top of the function to reflect what has been
change by the commit in Fixes.

Fixes: 40e986c99624 ("media: common: saa7146: replace BUG_ON by WARN_ON")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/common/saa7146/saa7146_core.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
index bcb957883044c..27c53eed8fe39 100644
--- a/drivers/media/common/saa7146/saa7146_core.c
+++ b/drivers/media/common/saa7146/saa7146_core.c
@@ -133,8 +133,8 @@ int saa7146_wait_for_debi_done(struct saa7146_dev *dev, int nobusyloop)
****************************************************************************/

/* this is videobuf_vmalloc_to_sg() from videobuf-dma-sg.c
- make sure virt has been allocated with vmalloc_32(), otherwise the BUG()
- may be triggered on highmem machines */
+ make sure virt has been allocated with vmalloc_32(), otherwise return NULL
+ on highmem machines */
static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
{
struct scatterlist *sglist;
@@ -150,7 +150,7 @@ static struct scatterlist* vmalloc_to_sg(unsigned char *virt, int nr_pages)
if (NULL == pg)
goto err;
if (WARN_ON(PageHighMem(pg)))
- return NULL;
+ goto err;
sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
}
return sglist;
--
2.39.2