From ebfe92ca65c780334bdf847ddc4eca15835bd9c0 Mon Sep 17 00:00:00 2001
From: =?utf8?q?R=C3=A9mi=20Denis-Courmont?= <remi.denis-courmont@nokia.com>
Date: Sun, 16 Nov 2008 19:48:49 -0800
Subject: [PATCH] Phonet: refuse to send bigger than MTU packets
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Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/phonet/af_phonet.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index defeb7a0d50..7ab30f668b5 100644
--- 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) {
-		/* Phonet length field would overflow */
+	if (skb->len + 2 > 0xffff /* Phonet length field limit */ ||
+	    skb->len + sizeof(struct phonethdr) > dev->mtu) {
 		err = -EMSGSIZE;
 		goto drop;
 	}
-- 
2.20.1