diff --git a/net/802/garp.c b/net/802/garp.c
index 8e19f51833d6..3845f619f602 100644
--- a/net/802/garp.c
+++ b/net/802/garp.c
@@ -455,7 +455,7 @@ static int garp_pdu_parse_attr(struct garp_applicant *app, struct sk_buff *skb,
 	if (!pskb_may_pull(skb, ga->len))
 		return -1;
 	skb_pull(skb, ga->len);
-	dlen = sizeof(*ga) - ga->len;
+	dlen = ga->len - sizeof(*ga);
 
 	if (attrtype > app->app->maxattr)
 		return 0;