This is a note to let you know that I've just added the patch titled
media: v4l: async: Fix NULL pointer dereference in adding ancillary links
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-v4l-async-fix-null-pointer-dereference-in-addi.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5f89209bba1e4f075011d83ea0361e3be6751ece
Author: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
Date: Wed May 8 10:51:49 2024 +0800
media: v4l: async: Fix NULL pointer dereference in adding ancillary links
[ Upstream commit 9b4667ea67854f0b116fe22ad11ef5628c5b5b5f ]
In v4l2_async_create_ancillary_links(), ancillary links are created for
lens and flash sub-devices. These are sub-device to sub-device links and
if the async notifier is related to a V4L2 device, the source sub-device
of the ancillary link is NULL, leading to a NULL pointer dereference.
Check the notifier's sd field is non-NULL in
v4l2_async_create_ancillary_links().
Fixes: aa4faf6eb271 ("media: v4l2-async: Create links during v4l2_async_match_notify()")
Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
[Sakari Ailus: Reword the subject and commit messages slightly.]
Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
index 008a2a3e312e0..7471dbd140409 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -302,6 +302,9 @@ static int v4l2_async_create_ancillary_links(struct v4l2_async_notifier *n,
sd->entity.function != MEDIA_ENT_F_FLASH)
return 0;
+ if (!n->sd)
+ return 0;
+
link = media_create_ancillary_link(&n->sd->entity, &sd->entity);
#endif
