[RHEL 5.4] ipv6: Fix OOPS in ip6_dst_lookup_tail()

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Issue

[RHEL 5.4] ipv6: Fix OOPS in ip6_dst_lookup_tail()
When the ipv6 packet is transmitted if dst->neighbour is NULL, the kernel crashes at function ip6_dst_lookup_tail.

Environment

Red Hat Enterprise Linux 5 Update 4
kernel-2.6.18-164.el5
x86_64

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