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| author | Amir Goldstein <amir73il@gmail.com> | 2019-12-06 09:33:36 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-17 22:39:21 +0300 |
| commit | 6890751cfea7d79d998b049647a8c49e2f288ed0 (patch) | |
| tree | 926ea6b28daa47e5cc7332db5c16b6282f81ea5c /fs/overlayfs | |
| parent | 02072c31e11badb90cc5000fe240ddd2b538570c (diff) | |
| download | linux-6890751cfea7d79d998b049647a8c49e2f288ed0.tar.xz | |
ovl: relax WARN_ON() on rename to self
commit 6889ee5a53b8d969aa542047f5ac8acdc0e79a91 upstream.
In ovl_rename(), if new upper is hardlinked to old upper underneath
overlayfs before upper dirs are locked, user will get an ESTALE error
and a WARN_ON will be printed.
Changes to underlying layers while overlayfs is mounted may result in
unexpected behavior, but it shouldn't crash the kernel and it shouldn't
trigger WARN_ON() either, so relax this WARN_ON().
Reported-by: syzbot+bb1836a212e69f8e201a@syzkaller.appspotmail.com
Fixes: 804032fabb3b ("ovl: don't check rename to self")
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/dir.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index ef11fa7b869e..8c561703275a 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -1042,7 +1042,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old, if (newdentry == trap) goto out_dput; - if (WARN_ON(olddentry->d_inode == newdentry->d_inode)) + if (olddentry->d_inode == newdentry->d_inode) goto out_dput; err = 0; |