netdev - [PATCH] ipv4: initialise the itag variable in __mkroute

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Message-Id: <1400747815-3470-1-git-send-email-roy.qing.li@gmail.com>
Date:	Thu, 22 May 2014 16:36:55 +0800
From:	roy.qing.li@...il.com
To:	netdev@...r.kernel.org
Subject: [PATCH] ipv4: initialise the itag variable in __mkroute_input

From: Li RongQing <roy.qing.li@...il.com>

the value of itag is a random value from stack, and may not be initiated by
fib_validate_source, which called fib_combine_itag if CONFIG_IP_ROUTE_CLASSID
is not set

This will make the cached dst uncertainty

Signed-off-by: Li RongQing <roy.qing.li@...il.com>
---
 net/ipv4/route.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 50e1e0f..4154eb7 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1526,7 +1526,7 @@ static int __mkroute_input(struct sk_buff *skb,
 	struct in_device *out_dev;
 	unsigned int flags = 0;
 	bool do_cache;
-	u32 itag;
+	u32 itag = 0;
 
 	/* get a working reference to the output device */
 	out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res));
-- 
1.7.10.4

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