linux-kernel - [PATCH 3.19 6/7] ipv4: Missing sk_nulls_node_init() in ping

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Message-Id: <20150508111055.727761281@linuxfoundation.org>
Date:	Fri,  8 May 2015 13:12:25 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Wen Xu <hotdog3645@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.19 6/7] ipv4: Missing sk_nulls_node_init() in ping_unhash().

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "David S. Miller" <davem@...emloft.net>

[ Upstream commit a134f083e79fb4c3d0a925691e732c56911b4326 ]

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@...ux-foundation.org>
Reported-by: Wen Xu <hotdog3645@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv4/ping.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -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;


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