| From | Jiri Slaby <> | Subject | [PATCH 3.12 084/142] ipv4: Missing sk_nulls_node_init() in ping_unhash(). | Date | Sat, 16 May 2015 09:37:24 +0200 |
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From: "David S. Miller" <davem@davemloft.net>
3.12-stable review patch. If anyone has any objections, please let me know.
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[ 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@linux-foundation.org> Reported-by: Wen Xu <hotdog3645@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jiri Slaby <jslaby@suse.cz> --- net/ipv4/ping.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index a9f8e66f6dad..54012b8c0ef9 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -154,6 +154,7 @@ 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; -- 2.3.7
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