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

Message ID 20210509082402.4660-1-lyl2019@mail.ustc.edu.cn
State Accepted
Commit 7dd0c9e547b6924e18712b6b51aa3cba1896ee2c
Headers show
Series media:v4l2-core: Avoid the dangling pointer in v4l2_fh_release | expand

Commit Message

Lv Yunlong May 9, 2021, 8:24 a.m. UTC 
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>
---
 drivers/media/v4l2-core/v4l2-fh.c | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/drivers/media/v4l2-core/v4l2-fh.c b/drivers/media/v4l2-core/v4l2-fh.c
index 684574f58e82..90eec79ee995 100644
--- a/drivers/media/v4l2-core/v4l2-fh.c
+++ b/drivers/media/v4l2-core/v4l2-fh.c
@@ -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;
 }