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media: v4l2-core: Avoid the dangling pointer in v4l2_fh_release

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[ Upstream commit 7dd0c9e547b6924e18712b6b51aa3cba1896ee2c ]

A use after free bug caused by the dangling pointer
filp->privitate_data in v4l2_fh_release.
See https://lore.kernel.org/patchwork/patch/1419058/.

My patch sets the dangling pointer to NULL to provide
robust.

Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lv Yunlong 2021-05-09 10:24:02 +02:00 committed by Greg Kroah-Hartman
parent a70de431f7
commit 3790d56daf
1 changed files with 1 additions and 0 deletions
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1
drivers/media/v4l2-core/v4l2-fh.c
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@ -96,6 +96,7 @@ int v4l2_fh_release(struct file *filp)
v4l2_fh_del(fh);
v4l2_fh_exit(fh);
kfree(fh);
filp->private_data = NULL;
}
return 0;
}