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authorAmir Goldstein <amir73il@gmail.com>2019-12-06 07:33:36 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2019-12-10 16:00:55 +0100
commit6889ee5a53b8d969aa542047f5ac8acdc0e79a91 (patch)
tree73f32667320449fcc809d211f5d44714de8a9b05 /fs
parentovl: fix corner case of non-unique st_dev;st_ino (diff)
downloadlinux-6889ee5a53b8d969aa542047f5ac8acdc0e79a91.tar.xz
linux-6889ee5a53b8d969aa542047f5ac8acdc0e79a91.zip
ovl: relax WARN_ON() on rename to self
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/overlayfs/dir.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 702aa63f6774..29abdb1d3b5c 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -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;