diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2316a4315a18..81702b9ba5be 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2853,7 +2853,8 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 		pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
 	}
 	if (rta[IFA_LOCAL-1]) {
-		if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
+		if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
+		    (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
 			return -EINVAL;
 		pfx = RTA_DATA(rta[IFA_LOCAL-1]);
 	}
@@ -2877,7 +2878,8 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
 		pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
 	}
 	if (rta[IFA_LOCAL-1]) {
-		if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
+		if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) ||
+		    (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx))))
 			return -EINVAL;
 		pfx = RTA_DATA(rta[IFA_LOCAL-1]);
 	}