From c0b8da1e7613a11ce7e44560aae507b62da1f846 Mon Sep 17 00:00:00 2001
From: =?utf8?q?YOSHIFUJI=20Hideaki/=E5=90=89=E8=97=A4=E8=8B=B1=E6=98=8E?=
 <hideaki.yoshifuji@miraclelinux.com>
Date: Mon, 13 Jul 2015 23:28:10 +0900
Subject: [PATCH] ipv6: Fix finding best source address in
 ipv6_dev_get_saddr().

Commit 9131f3de2 ("ipv6: Do not iterate over all interfaces when
finding source address on specific interface.") did not properly
update best source address available.  Plus, it introduced
possible NULL pointer dereference.

Bug was reported by Erik Kline <ek@google.com>.
Based on patch proposed by Hajime Tazaki <thehajime@gmail.com>.

Fixes: 9131f3de24db4dc12199aede7d931e6703e97f3b ("ipv6: Do not
	iterate over all interfaces when finding source address
	on specific interface.")
Signed-off-by: YOSHIFUJI Hideaki <hideaki.yoshifuji@miraclelinux.com>
Acked-by: Hajime Tazaki <thehajime@gmail.com>
Acked-by: Erik Kline <ek@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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