libceph: allow ceph_buffer_put() to receive a NULL ceph_buffer

Luis Henriques · idryomov · commit 5c498950f730 · 2019-08-22T10:47:41.000+02:00
Signed-off-by: Luis Henriques &lt;lhenriques@suse.com&gt;
Reviewed-by: Jeff Layton &lt;jlayton@kernel.org&gt;
Signed-off-by: Ilya Dryomov &lt;idryomov@gmail.com&gt;
diff --git a/include/linux/ceph/buffer.h b/include/linux/ceph/buffer.h
@@ -30,7 +30,8 @@ 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);

Original file line number	Diff line number	Diff line change
`@@ -30,7 +30,8 @@ static inline struct ceph_buffer ceph_buffer_get(struct ceph_buffer b)`
`30`	`30`
`31`	`31`	`static inline void ceph_buffer_put(struct ceph_buffer *b)`
`32`	`32`	`{`
`33`		`- kref_put(&b->kref, ceph_buffer_release);`
	`33`	`+ if (b)`
	`34`	`+ kref_put(&b->kref, ceph_buffer_release);`
`34`	`35`	`}`
`35`	`36`
`36`	`37`	`extern int ceph_decode_buffer(struct ceph_buffer b, void p, void *end);`