netdev - [PATCH] tipc: reinitialize pointer after skb linearize

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Message-ID: <1442565991-4531-1-git-send-email-erik.hugne@ericsson.com>
Date:	Fri, 18 Sep 2015 10:46:31 +0200
From:	<erik.hugne@...csson.com>
To:	<netdev@...r.kernel.org>
CC:	<tipc-discussion@...ts.sourceforge.net>,
	Erik Hugne <erik.hugne@...csson.com>
Subject: [PATCH] tipc: reinitialize pointer after skb linearize

From: Erik Hugne <erik.hugne@...csson.com>

The msg pointer into header may change after skb linearization.
We must reinitialize it after calling skb_linearize to prevent
operating on a freed or invalid pointer.

Signed-off-by: Erik Hugne <erik.hugne@...csson.com>
Reported-by: Tamás Végh <tamas.vegh@...csson.com>
---
 net/tipc/msg.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index 562c926..c5ac436 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -539,6 +539,7 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err)
 	*err = -TIPC_ERR_NO_NAME;
 	if (skb_linearize(skb))
 		return false;
+	msg = buf_msg(skb);
 	if (msg_reroute_cnt(msg))
 		return false;
 	dnode = addr_domain(net, msg_lookup_scope(msg));
-- 
2.1.4

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