linux-kernel - [PATCH 4.9 051/130] ceph: fix dentry leak in splice

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Message-Id: <20180823074930.525019900@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:52:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Yan, Zheng" <zyan@...hat.com>,
        Jeff Layton <jlayton@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 051/130] ceph: fix dentry leak in splice_dentry()

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Yan, Zheng" <zyan@...hat.com>

[ Upstream commit 8b8f53af1ed9df88a4c0fbfdf3db58f62060edf3 ]

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

Signed-off-by: "Yan, Zheng" <zyan@...hat.com>
Reviewed-by: Jeff Layton <jlayton@...hat.com>
Signed-off-by: Ilya Dryomov <idryomov@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/ceph/inode.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1077,6 +1077,7 @@ static struct dentry *splice_dentry(stru
 	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) {