linux-kernel - [PATCH 4.14 194/496] ceph: fix potential memory leak in init

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Date:   Mon, 28 May 2018 11:59:39 +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, Chengguang Xu <cgxu519@...oud.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 194/496] ceph: fix potential memory leak in init_caches()

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

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

From: Chengguang Xu <cgxu519@...oud.com>

[ Upstream commit 1c789249578895bb14ab62b4327306439b754857 ]

There is lack of cache destroy operation for ceph_file_cachep
when failing from fscache register.

Signed-off-by: Chengguang Xu <cgxu519@...oud.com>
Reviewed-by: Ilya Dryomov <idryomov@...il.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/super.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -712,14 +712,17 @@ static int __init init_caches(void)
 		goto bad_dentry;
 
 	ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD);
-
 	if (!ceph_file_cachep)
 		goto bad_file;
 
-	if ((error = ceph_fscache_register()))
-		goto bad_file;
+	error = ceph_fscache_register();
+	if (error)
+		goto bad_fscache;
 
 	return 0;
+
+bad_fscache:
+	kmem_cache_destroy(ceph_file_cachep);
 bad_file:
 	kmem_cache_destroy(ceph_dentry_cachep);
 bad_dentry: