From: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Date: Wed, 26 May 2010 00:44:44 +0000 (+0000)
Subject: Phonet: listening socket lock protects the connected socket list
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7dfde179c38056b91d51e60f3d50902387f27c84;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

Phonet: listening socket lock protects the connected socket list

The accept()'d socket need to be unhashed while the (listen()'ing)
socket lock is held. This fixes a race condition that could lead to an
OOPS.

Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/phonet/pep.c b/net/phonet/pep.c
index 7b048a35ca58..94d72e85a475 100644
--- a/net/phonet/pep.c
+++ b/net/phonet/pep.c
@@ -1045,12 +1045,12 @@ static void pep_sock_unhash(struct sock *sk)
 	lock_sock(sk);
 	if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
 		skparent = pn->listener;
-		sk_del_node_init(sk);
 		release_sock(sk);
 
-		sk = skparent;
 		pn = pep_sk(skparent);
-		lock_sock(sk);
+		lock_sock(skparent);
+		sk_del_node_init(sk);
+		sk = skparent;
 	}
 	/* Unhash a listening sock only when it is closed
 	 * and all of its active connected pipes are closed. */