From 27c24fda62b601d6f9ca5e992502578c4310876f Mon Sep 17 00:00:00 2001
From: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Date: Tue, 10 Aug 2021 12:14:07 +0800
Subject: [PATCH] Bluetooth: switch to lock_sock in SCO
Git-commit: 27c24fda62b601d6f9ca5e992502578c4310876f
Patch-mainline: v5.15-rc1
References: CVE-2021-3640 bsc#1188172

Since sco_sock_timeout is now scheduled using delayed work, it is no
longer run in SOFTIRQ context. Hence bh_lock_sock is no longer
necessary in SCO to synchronise between user contexts and SOFTIRQ
processing.

As such, calls to bh_lock_sock should be replaced with lock_sock to
synchronize with other concurrent processes that use lock_sock.

Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/bluetooth/sco.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -92,10 +92,10 @@ static void sco_sock_timeout(struct work
 
 	BT_DBG("sock %p state %d", sk, sk->sk_state);
 
-	bh_lock_sock(sk);
+	lock_sock(sk);
 	sk->sk_err = ETIMEDOUT;
 	sk->sk_state_change(sk);
-	bh_unlock_sock(sk);
+	release_sock(sk);
 
 	sco_sock_kill(sk);
 	sock_put(sk);
@@ -192,10 +192,10 @@ static void sco_conn_del(struct hci_conn
 
 	if (sk) {
 		sock_hold(sk);
-		bh_lock_sock(sk);
+		lock_sock(sk);
 		sco_sock_clear_timer(sk);
 		sco_chan_del(sk, err);
-		bh_unlock_sock(sk);
+		release_sock(sk);
 		sco_sock_kill(sk);
 		sock_put(sk);
 
@@ -1047,10 +1047,10 @@ static void sco_conn_ready(struct sco_co
 
 	if (sk) {
 		sco_sock_clear_timer(sk);
-		bh_lock_sock(sk);
+		lock_sock(sk);
 		sk->sk_state = BT_CONNECTED;
 		sk->sk_state_change(sk);
-		bh_unlock_sock(sk);
+		release_sock(sk);
 	} else {
 		sco_conn_lock(conn);
 
@@ -1065,12 +1065,12 @@ static void sco_conn_ready(struct sco_co
 			return;
 		}
 
-		bh_lock_sock(parent);
+		lock_sock(parent);
 
 		sk = sco_sock_alloc(sock_net(parent), NULL,
 				    BTPROTO_SCO, GFP_ATOMIC, 0);
 		if (!sk) {
-			bh_unlock_sock(parent);
+			release_sock(parent);
 			sco_conn_unlock(conn);
 			return;
 		}
@@ -1091,7 +1091,7 @@ static void sco_conn_ready(struct sco_co
 		/* Wake up parent */
 		parent->sk_data_ready(parent);
 
-		bh_unlock_sock(parent);
+		release_sock(parent);
 
 		sco_conn_unlock(conn);
 	}