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30 lines
980 B
Diff
30 lines
980 B
Diff
From a134f083e79fb4c3d0a925691e732c56911b4326 Mon Sep 17 00:00:00 2001
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From: "David S. Miller" <davem@davemloft.net>
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Date: Fri, 1 May 2015 22:02:47 -0400
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Subject: [PATCH] ipv4: Missing sk_nulls_node_init() in ping_unhash().
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If we don't do that, then the poison value is left in the ->pprev
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backlink.
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This can cause crashes if we do a disconnect, followed by a connect().
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Tested-by: Linus Torvalds <torvalds@linux-foundation.org>
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Reported-by: Wen Xu <hotdog3645@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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net/ipv4/ping.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
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index a93f260cf24ca..05ff44b758dfe 100644
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--- a/net/ipv4/ping.c
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+++ b/net/ipv4/ping.c
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@@ -158,6 +158,7 @@ void ping_unhash(struct sock *sk)
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if (sk_hashed(sk)) {
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write_lock_bh(&ping_table.lock);
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hlist_nulls_del(&sk->sk_nulls_node);
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+ sk_nulls_node_init(&sk->sk_nulls_node);
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sock_put(sk);
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isk->inet_num = 0;
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isk->inet_sport = 0;
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