diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 360b565918c4b524d561a010ed7ec5df02312cdb..d2bf02e0a6787c2487ae09499d5b8dac1da4ac94 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -392,8 +392,10 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
 	if (elen <= 0)
 		goto out;
 
-	if ((err = skb_cow_data(skb, 0, &trailer)) < 0)
+	err = skb_cow_data(skb, 0, &trailer);
+	if (err < 0)
 		goto out;
+
 	nfrags = err;
 
 	assoclen = sizeof(*esph);