From: chenying chenying.kernel@bytedance.com
stable inclusion from linux-4.19.207 commit 1bc41e47e0ee05367b2efbdd95bdc2d4e7fcc164
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commit 52d5a0c6bd8a89f460243ed937856354f8f253a3 upstream.
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@b... Cc: stable@vger.kernel.org # v4.18 Signed-off-by: Miklos Szeredi mszeredi@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- fs/overlayfs/dir.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c index 74340542824a4..9902c1706be91 100644 --- a/fs/overlayfs/dir.c +++ b/fs/overlayfs/dir.c @@ -517,8 +517,10 @@ 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: