netdev - [PATCH v2] bridge: Reset IPCB on forward non-local packets in br_handle_frame

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Message-ID: <4EB19BF9.8060801@parallels.com>
Date:	Wed, 02 Nov 2011 23:37:29 +0400
From:	Vasily Averin <vvs@...allels.com>
To:	"David S. Miller" <davem@...emloft.net>
CC:	bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
	Herbert Xu <herbert@...dor.hengli.com.au>, devel@...nvz.org
Subject: [PATCH v2] bridge: Reset IPCB on forward non-local packets in br_handle_frame_finish()

v2: extra bracket was removed

if dst is not local br_handle_frame_finish() does not clone original skb and
forgets to reset IPCB before return to IP stack. it can lead to stack corruption
in icmp_send()

Signed-off-by: Vasily Averin <vvs@...ru>
---
 net/bridge/br_input.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/bridge/br_input.c b/net/bridge/br_input.c
index f06ee39..6be8d00 100644
--- a/net/bridge/br_input.c
+++ b/net/bridge/br_input.c
@@ -93,10 +93,11 @@ int br_handle_frame_finish(struct sk_buff *skb)
 			skb2 = skb;

 		br->dev->stats.multicast++;
-	} else if ((dst = __br_fdb_get(br, dest)) && dst->is_local) {
+	} else if ((dst = __br_fdb_get(br, dest)) != NULL) {
 		skb2 = skb;
 		/* Do not forward the packet since it's local. */
-		skb = NULL;
+		if (dst->is_local)
+			skb = NULL;
 	}

 	if (skb) {
-- 1.7.5.4
--
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