From f752a0b334bb95fe9b42ecb511e0864e2768046f Mon Sep 17 00:00:00 2001 From: Zhengping Jiang Date: Wed, 24 May 2023 17:04:15 -0700 Subject: Bluetooth: L2CAP: Fix use-after-free Fix potential use-after-free in l2cap_le_command_rej. Signed-off-by: Zhengping Jiang Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Jakub Kicinski --- net/bluetooth/l2cap_core.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'net/bluetooth/l2cap_core.c') diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index c5e8798e297c..17ca13e8c044 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -6374,9 +6374,14 @@ static inline int l2cap_le_command_rej(struct l2cap_conn *conn, if (!chan) goto done; + chan = l2cap_chan_hold_unless_zero(chan); + if (!chan) + goto done; + l2cap_chan_lock(chan); l2cap_chan_del(chan, ECONNREFUSED); l2cap_chan_unlock(chan); + l2cap_chan_put(chan); done: mutex_unlock(&conn->chan_lock); -- cgit v1.2.3