Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.4 08/15] media: v4l2-core: Avoid the dangling pointer in v4l2_fh_release | Date | Sun, 4 Jul 2021 19:12:14 -0400 |
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From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
[ 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> --- drivers/media/v4l2-core/v4l2-fh.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c index 1d076deb05a9..ce844ecc3340 100644 --- a/drivers/media/v4l2-core/v4l2-fh.c +++ b/drivers/media/v4l2-core/v4l2-fh.c @@ -107,6 +107,7 @@ int v4l2_fh_release(struct file *filp) v4l2_fh_del(fh); v4l2_fh_exit(fh); kfree(fh); + filp->private_data = NULL; } return 0; } -- 2.30.2
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