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Commit a134f083 authored by David S. Miller's avatar David S. Miller
Browse files

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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Reported-by: default avatarWen Xu <hotdog3645@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e813bb2b

net/ipv4/ping.c

+1 −0
Original line number Diff line number Diff line
@@ -158,6 +158,7 @@ void ping_unhash(struct sock *sk) 
	if (sk_hashed(sk)) {

		write_lock_bh(&ping_table.lock);

		hlist_nulls_del(&sk->sk_nulls_node);

		sk_nulls_node_init(&sk->sk_nulls_node);

		sock_put(sk);

		isk->inet_num = 0;

		isk->inet_sport = 0;