linux-kernel - [PATCH] Fix "possible circular locking dependency" in rfcomm

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Date:	Tue, 8 Mar 2011 10:10:10 +0000
From:	"Ferraton, Jean RegisX" <jean.regisx.ferraton@...el.com>
To:	"marcel@...tmann.org" <marcel@...tmann.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"xiaosuo@...il.com" <xiaosuo@...il.com>,
	"linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] Fix "possible circular locking dependency" in rfcomm

Changes in sock.c in function __rfcomm_sock_close, to release sock before calling rfcomm_dlc_close to avoid possible deadlock when calling rfcomm_lock (in rfcomm_dlc_close).

Signed-off-by: Jean Regis Ferraton <jrferraton@...il.com>

---
 net/bluetooth/rfcomm/sock.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index 66cc1f0..3b5ec09 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -234,7 +234,10 @@ static void __rfcomm_sock_close(struct sock *sk)
 	case BT_CONNECT2:
 	case BT_CONFIG:
 	case BT_CONNECTED:
+		/* release_sock to avoid deadlock when calling rfcomm_lock() */
+		release_sock(sk);
 		rfcomm_dlc_close(d, 0);
+		lock_sock(sk);
 
 	default:
 		sock_set_flag(sk, SOCK_ZAPPED);
-- 
1.6.2.5

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