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authorchenying <chenying.kernel@bytedance.com>2021-08-16 13:02:56 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2021-08-17 18:37:53 +0300
commit52d5a0c6bd8a89f460243ed937856354f8f253a3 (patch)
tree3768f7f260041199ccabbab03f0fc6a37dfbadd2 /fs/overlayfs
parentf945ca1963c8bd29471020d7c58c594ee7007006 (diff)
downloadlinux-52d5a0c6bd8a89f460243ed937856354f8f253a3.tar.xz
ovl: fix BUG_ON() in may_delete() when called from ovl_cleanup()
If function ovl_instantiate() returns an error, ovl_cleanup will be called and try to remove newdentry from wdir, but the newdentry has been moved to udir at this time. This will causes BUG_ON(victim->d_parent->d_inode != dir) in fs/namei.c:may_delete. Signed-off-by: chenying <chenying.kernel@bytedance.com> Fixes: 01b39dcc9568 ("ovl: use inode_insert5() to hash a newly created inode") Link: https://lore.kernel.org/linux-unionfs/e6496a94-a161-dc04-c38a-d2544633acb4@bytedance.com/ Cc: <stable@vger.kernel.org> # v4.18 Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/dir.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 9154222883e6..1fefb2b8960e 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -545,8 +545,10 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
goto out_cleanup;
}
err = ovl_instantiate(dentry, inode, newdentry, hardlink);
- if (err)
- goto out_cleanup;
+ if (err) {
+ ovl_cleanup(udir, newdentry);
+ dput(newdentry);
+ }
out_dput:
dput(upper);
out_unlock: