From: Yan, Zheng <zyan@redhat.com>
Date: Tue, 19 Jun 2018 10:20:34 +0000 (+0800)
Subject: ceph: fix dentry leak in splice_dentry()
X-Git-Tag: v4.14.67~120
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=77c967872e8efe1341696bacfa1f793aedcc9f0d;p=users%2Fjedix%2Flinux-maple.git

ceph: fix dentry leak in splice_dentry()

[ Upstream commit 8b8f53af1ed9df88a4c0fbfdf3db58f62060edf3 ]

In any case, d_splice_alias() does not drop reference of original
dentry.

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index f2550a076edc..d5124ed35154 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1087,6 +1087,7 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in)
 	if (IS_ERR(realdn)) {
 		pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
 		       PTR_ERR(realdn), dn, in, ceph_vinop(in));
+		dput(dn);
 		dn = realdn; /* note realdn contains the error */
 		goto out;
 	} else if (realdn) {