diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index a3e1dec96a748..020f74a743eed 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -698,6 +698,9 @@ static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
 	else
 		fl6->daddr = tunnel->parms.raddr;
 
+	if (skb_cow_head(skb, dev->needed_headroom ?: tunnel->hlen))
+		return -ENOMEM;
+
 	/* Push GRE header. */
 	protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;