Phonet: refuse to send bigger than MTU packets

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>

Phonet: refuse to send bigger than MTU packets
Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
ebfe92ca · Rémi Denis-Courmont · David S. Miller · eb7c3adb · ebfe92ca
Commit ebfe92ca authored Nov 16, 2008 by Rémi Denis-Courmont Committed by David S. Miller Nov 16, 2008
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net/phonet/af_phonet.c net/phonet/af_phonet.c +2 -2

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--- a/net/phonet/af_phonet.c
+++ b/net/phonet/af_phonet.c
@@ -144,8 +144,8 @@ static int pn_send(struct sk_buff *skb, struct net_device *dev,
 	struct phonethdr *ph;
 	int err;
-	if (skb->len + 2 > 0xffff) {
+	if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
-		/* Phonet length field would overflow */
+	    skb->len + sizeof(struct phonethdr) > dev->mtu) {
 		err = -EMSGSIZE;
 		goto drop;
 	}