Reserve the correct amount of headroom

1 files changed, 3 insertions, 2 deletions

diff --git a/quicktun.c b/quicktun.c
index 2887942..f57e480 100644
--- a/quicktun.c
+++ b/quicktun.c
@@ -87,8 +87,9 @@ static netdev_tx_t quicktun_net_xmit(struct sk_buff *skb, struct net_device *dev
 			goto error;
 		}
 
-		if (skb_headroom(skb) < (LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) + sizeof(struct udphdr)) || skb_shared(skb) || (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
-			struct sk_buff *new_skb = skb_realloc_headroom(skb, sizeof(struct iphdr) + sizeof(struct udphdr));
+		if (skb_headroom(skb) < (LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) + sizeof(struct udphdr))
+		    || skb_shared(skb) || (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+			struct sk_buff *new_skb = skb_realloc_headroom(skb, LL_RESERVED_SPACE(rt->dst.dev) + sizeof(struct iphdr) + sizeof(struct udphdr));
 			if (!new_skb) {
 				tun->dev->stats.tx_dropped++;
 				goto error;