From: Luis Henriques <lhenriques@suse.com>
Date: Fri, 19 Jul 2019 14:32:19 +0000 (+0100)
Subject: libceph: allow ceph_buffer_put() to receive a NULL ceph_buffer
X-Git-Tag: v4.4.192~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c3083eff1b1b3bdae7389ff0e2fb7ae9423561e4;p=thirdparty%2Fkernel%2Fstable.git

libceph: allow ceph_buffer_put() to receive a NULL ceph_buffer

[ Upstream commit 5c498950f730aa17c5f8a2cdcb903524e4002ed2 ]

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/include/linux/ceph/buffer.h b/include/linux/ceph/buffer.h
index 07ca15e761001..dada47a4360ff 100644
--- a/include/linux/ceph/buffer.h
+++ b/include/linux/ceph/buffer.h
@@ -29,7 +29,8 @@ static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
 
 static inline void ceph_buffer_put(struct ceph_buffer *b)
 {
-	kref_put(&b->kref, ceph_buffer_release);
+	if (b)
+		kref_put(&b->kref, ceph_buffer_release);
 }
 
 extern int ceph_decode_buffer(struct ceph_buffer **b, void **p, void *end);