[PATCH 4.6 024/203] mnt: If fs_fully_visible fails call put_filesystem.

Greg Kroah-Hartman
2016-07-25T22:29:46Z

From: Eric W. Biederman <ebiederm@xmission.com>

commit 97c1df3e54e811aed484a036a798b4b25d002ecf upstream.

Add this trivial missing error handling.

Fixes: 1b852bceb0d1 ("mnt: Refactor the logic for mounting sysfs and proc in a user namespace")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
fs/namespace.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2409,8 +2409,10 @@ static int do_new_mount(struct path *pat
mnt_flags |= MNT_NODEV | MNT_LOCK_NODEV;
}
if (type->fs_flags & FS_USERNS_VISIBLE) {
- if (!fs_fully_visible(type, &mnt_flags))
+ if (!fs_fully_visible(type, &mnt_flags)) {
+ put_filesystem(type);
return -EPERM;
+ }
}
}