netdev - [PATCH net 1/1] Phonet: refuse to send bigger than MTU packets

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Message-Id: <1226653710-27642-1-git-send-email-remi.denis-courmont@nokia.com>
Date:	Fri, 14 Nov 2008 11:08:30 +0200
From:	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>
To:	netdev@...r.kernel.org
Subject: [PATCH net 1/1] Phonet: refuse to send bigger than MTU packets

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
---
 net/phonet/af_phonet.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
index defeb7a..7ab30f6 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;
 	}
-- 
1.5.4.3

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