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ipv4: Missing sk_nulls_node_init() in ping_unhash().
If we don't do that, then the poison value is left in the ->pprev backlink. This can cause crashes if we do a disconnect, followed by a connect(). Tested-by: Linus Torvalds <email@example.com> Reported-by: Wen Xu <firstname.lastname@example.org> Signed-off-by: David S. Miller <email@example.com>
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