From: Li RongQing <roy.qing.li@gmail.com>
Date: Thu, 22 May 2014 08:36:55 +0000 (+0800)
Subject: ipv4: initialise the itag variable in __mkroute_input
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=fbdc0ad095c0a299e9abf5d8ac8f58374951149a;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ipv4: initialise the itag variable in __mkroute_input

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@gmail.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index db1e0da871f4..5e676be3daeb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1519,7 +1519,7 @@ 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));