libceph: correctly decode ADDR2 addresses in incremental OSD maps

Given the new format, we have to decode the addresses twice. Once to
skip past the new_up_client field, and a second time to collect the
addresses.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

net/ceph/osdmap.c

@@ -1618,12 +1618,17 @@ static int decode_new_up_state_weight(void **p, void *end, u8 struct_v,
 	void *new_state;
 	void *new_weight_end;
 	u32 len;
+	int i;
 
 	new_up_client = *p;
 	ceph_decode_32_safe(p, end, len, e_inval);
-	len *= sizeof(u32) + sizeof(struct ceph_entity_addr);
-	ceph_decode_need(p, end, len, e_inval);
-	*p += len;
+	for (i = 0; i < len; ++i) {
+		struct ceph_entity_addr addr;
+
+		ceph_decode_skip_32(p, end, e_inval);
+		if (ceph_decode_entity_addr(p, end, &addr))
+			goto e_inval;
+	}
 
 	new_state = *p;
 	ceph_decode_32_safe(p, end, len, e_inval);
@@ -1699,9 +1704,9 @@ static int decode_new_up_state_weight(void **p, void *end, u8 struct_v,
 		struct ceph_entity_addr addr;
 
 		osd = ceph_decode_32(p);
-		ceph_decode_copy(p, &addr, sizeof(addr));
-		ceph_decode_addr(&addr);
 		BUG_ON(osd >= map->max_osd);
+		if (ceph_decode_entity_addr(p, end, &addr))
+			goto e_inval;
 		pr_info("osd%d up\n", osd);
 		map->osd_state[osd] |= CEPH_OSD_EXISTS | CEPH_OSD_UP;
 		map->osd_addr[osd] = addr;