ping: implement proper locking

commit 43a6684519ab0a6c52024b5e25322476cabad893 upstream.

We got a report of yet another bug in ping

http://www.openwall.com/lists/oss-security/2017/03/24/6

->disconnect() is not called with socket lock held.

Fix this by acquiring ping rwlock earlier.

Thanks to Daniel, Alexander and Andrey for letting us know this problem.

Fixes: c319b4d76b9e ("net: ipv4: add IPPROTO_ICMP socket kind")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Daniel Jiang <danieljiang0415@gmail.com>
Reported-by: Solar Designer <solar@openwall.com>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 571dabfe9ef3ee5e1a63469a1c63b74e104b8f03..3e3bd08199875658a743de36302d7408992129af 100644 (file)
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -154,17 +154,18 @@ void ping_hash(struct sock *sk)
 void ping_unhash(struct sock *sk)
 {
        struct inet_sock *isk = inet_sk(sk);
+
        pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
+       write_lock_bh(&ping_table.lock);
        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;
                sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
-               write_unlock_bh(&ping_table.lock);
        }
+       write_unlock_bh(&ping_table.lock);
 }
 EXPORT_SYMBOL_GPL(ping_unhash);