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media: common: saa7146: Avoid a leak in vmalloc_to_sg()

Message ID c9a526ef9600df82ffdea96413428bf34472b666.1682429093.git.christophe.jaillet@wanadoo.fr
State Accepted
Commit b2aa8ac6f97e26d788948fb60dcc5625c9633f4e
Headers show
Series media: common: saa7146: Avoid a leak in vmalloc_to_sg() | expand

Commit Message

Christophe JAILLET April 25, 2023, 1:25 p.m. UTC 
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>
---
 drivers/media/common/saa7146/saa7146_core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
index bcb957883044..27c53eed8fe3 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;