xfrm: Fix unlink race when policies are deleted.
When a policy is unlinked from the lists in thread context, the xfrm timer can fire before we can mark this policy as dead. So reinitialize the bydst hlist, then hlist_unhashed() will notice that this policy is not linked and will avoid a doulble unlink of that policy. Reported-by: NXianpeng Zhao <673321875@qq.com> Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>
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