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H A Dping.cdiff a134f083e79fb4c3d0a925691e732c56911b4326 Sat May 02 04:02:47 CEST 2015 David S. Miller <davem@davemloft.net> 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 <torvalds@linux-foundation.org>
Reported-by: Wen Xu <hotdog3645@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>