index 4788f6b37053..622345af323e 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1629,6 +1629,13 @@ static int __ip6_append_data(struct sock *sk,
  				err = -EINVAL;
  				goto error;
  			}
+			if (unlikely(alloclen < fraglen)) {
+				if (printk_ratelimit())
+					pr_warn("%s: wrong alloclen: %d, fraglen: %d",
+						__func__, alloclen, fraglen);
+				alloclen = fraglen;
+			}
+
  			if (transhdrlen) {
  				skb = sock_alloc_send_skb(sk, alloclen,
  						(flags & MSG_DONTWAIT), &err);