From: Desmond Cheong Zhi Xi
mainline inclusion
from mainline-v5.14-rc1
commit 27c24fda62b601d6f9ca5e992502578c4310876f
category: bugfix
issue: #I4NRS5
CVE: CVE-2021-3640
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
-------------------------------------------------
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
Signed-off-by: Luiz Augusto von Dentz
Signed-off-by: Lijun Fang
Reviewed-by: Xiu Jianfeng
Reviewed-by: Jason Yan
Signed-off-by: Chen Jun
Signed-off-by: Zheng Zengkai
Signed-off-by: Yu Changchun
---
net/bluetooth/sco.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 7c24a9acbc45..cb2b11683082 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -93,10 +93,10 @@ static void sco_sock_timeout(struct work_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);
sock_put(sk);
}
@@ -192,10 +192,10 @@ static void sco_conn_del(struct hci_conn *hcon, int err)
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);
sock_put(sk);
/* Ensure no more work items will run before freeing conn. */
@@ -1101,10 +1101,10 @@ static void sco_conn_ready(struct sco_conn *conn)
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);
@@ -1119,12 +1119,12 @@ static void sco_conn_ready(struct sco_conn *conn)
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;
}
@@ -1145,7 +1145,7 @@ static void sco_conn_ready(struct sco_conn *conn)
/* Wake up parent */
parent->sk_data_ready(parent);
- bh_unlock_sock(parent);
+ release_sock(parent);
sco_conn_unlock(conn);
}
--
2.25.1
