From 14df015bb1708cd7ba1e5af11a1b0365b165a3ef Mon Sep 17 00:00:00 2001
From: Matti Vaittinen <matti.vaittinen@nsn.com>
Date: Wed, 16 Nov 2011 21:18:02 +0000
Subject: [PATCH] IPV6 Fix a crash when trying to replace non existing route

This patch fixes a crash when non existing IPv6 route is tried to be changed.

When new destination node was inserted in middle of FIB6 tree, no relevant
sanity checks were performed. Later route insertion might have been prevented
due to invalid request, causing node with no rt info being left in tree.
When this node was accessed, a crash occurred.

Patch adds missing checks in fib6_add_1()

Signed-off-by: Matti Vaittinen <Mazziesaccount@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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