diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index d6282f0bcff8..cf34b35c9a90 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -517,6 +517,8 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 
 		ceph_decode_need(p, end, 4*sizeof(u32), bad);
 		b->id = ceph_decode_32(p);
+		if (b->id != -1 - i)
+			goto bad;
 		b->type = ceph_decode_16(p);
 		if (b->type == 0)
 			goto bad;