Currently, calls to sco_sock_set_timer are made under the locked
socket, but this does not apply to all calls to sco_sock_clear_timer.
Both sco_sock_{set,clear}_timer should be serialized by lock_sock to
prevent unexpected concurrent clearing/setting of timers.
Additionally, since sco_pi(sk)->conn is only cleared under the locked
socket, this change allows us to avoid races between
sco_sock_clear_timer and the call to kfree(conn) in sco_conn_del.
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>
---
net/bluetooth/sco.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 68b51e321e82..77490338f4fa 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -453,8 +453,8 @@ static void __sco_sock_close(struct sock *sk)
/* Must be called on unlocked socket. */
static void sco_sock_close(struct sock *sk)
{
- sco_sock_clear_timer(sk);
lock_sock(sk);
+ sco_sock_clear_timer(sk);
__sco_sock_close(sk);
release_sock(sk);
sco_sock_kill(sk);
@@ -1104,8 +1104,8 @@ static void sco_conn_ready(struct sco_conn *conn)
BT_DBG("conn %p", conn);
if (sk) {
- sco_sock_clear_timer(sk);
lock_sock(sk);
+ sco_sock_clear_timer(sk);
sk->sk_state = BT_CONNECTED;
sk->sk_state_change(sk);
release_sock(sk);
--
2.25.1
