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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: aa4faf6eb2 ("media: v4l2-async: Create links during v4l2_async_match_notify()")
Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
[Sakari Ailus: Reword the subject and commit messages slightly.]
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
ChiYuan Huang 2024-05-08 10:51:49 +08:00 committed by Greg Kroah-Hartman
parent 88a45f9dc1
commit 249212ceb4
1 changed files with 3 additions and 0 deletions
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3
drivers/media/v4l2-core/v4l2-async.c
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@ -324,6 +324,9 @@ 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