diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 669348d883f0..2095e73ccf6c 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -1705,7 +1705,7 @@ static int osdmap_decode(void **p, void *end, bool msgr2,
 	ceph_decode_need(p, end, 3*sizeof(u32) +
 			 map->max_osd*(struct_v >= 5 ? sizeof(u32) :
 						       sizeof(u8)) +
-				       sizeof(*map->osd_weight), e_inval);
+			 map->max_osd*sizeof(*map->osd_weight), e_inval);
 	if (ceph_decode_32(p) != map->max_osd)
 		goto e_inval;