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ovl: relax WARN_ON() on rename to self 

commit 6889ee5a53 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: 804032fabb ("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>
5.4-rM2-2.2.x-imx-squashed
Amir Goldstein 2019-12-06 08:33:36 +02:00 committed by Greg Kroah-Hartman
parent f96384a621
commit 82a0e25734
1 changed files with 1 additions and 1 deletions
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2
fs/overlayfs/dir.c
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@ -1170,7 +1170,7 @@ 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;