libceph: fix misjudgement of maximum monitor number
num_mon should allow up to CEPH_MAX_MON in ceph_monmap_decode().
Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index 1547107..b3dac24 100644
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -60,7 +60,7 @@ struct ceph_monmap *ceph_monmap_decode(void *p, void *end)
num_mon = ceph_decode_32(&p);
ceph_decode_need(&p, end, num_mon*sizeof(m->mon_inst[0]), bad);
- if (num_mon >= CEPH_MAX_MON)
+ if (num_mon > CEPH_MAX_MON)
goto bad;
m = kmalloc(sizeof(*m) + sizeof(m->mon_inst[0])*num_mon, GFP_NOFS);
if (m == NULL)