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| author | Lv Yunlong <lyl2019@mail.ustc.edu.cn> | 2021-05-09 11:24:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-20 17:17:31 +0300 |
| commit | 01da7812c03bbce49efd1037e7eb4c20984e6fa0 (patch) | |
| tree | 1ba386ebfb385ad27706c2c7e53112749750c750 | |
| parent | d4f48bb8b973a5cbef39f58c8213b032d66bb354 (diff) | |
| download | linux-01da7812c03bbce49efd1037e7eb4c20984e6fa0.tar.xz | |
media: v4l2-core: Avoid the dangling pointer in v4l2_fh_release
[ 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>
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-fh.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c index c91a7bd3ecfc..ac8282d059fc 100644 --- a/drivers/media/v4l2-core/v4l2-fh.c +++ b/drivers/media/v4l2-core/v4l2-fh.c @@ -104,6 +104,7 @@ int v4l2_fh_release(struct file *filp) v4l2_fh_del(fh); v4l2_fh_exit(fh); kfree(fh); + filp->private_data = NULL; } return 0; } |