diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 0017ccb..024ae56 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -455,6 +455,8 @@
 			skb = add_grhead(skb, pmc, type, &pgr);
 			first = 0;
 		}
+		if (!skb)
+			return NULL;
 		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 		*psrc = psf->sf_inaddr;
 		scount++; stotal++;
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 882cde4..e3ec216 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1582,6 +1582,8 @@
 			skb = add_grhead(skb, pmc, type, &pgr);
 			first = 0;
 		}
+		if (!skb)
+			return NULL;
 		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
 		*psrc = psf->sf_addr;
 		scount++; stotal++;