netdev - Re: [PATCH] Bluetooth: L2CAP: fix an illegal state transition from BT

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Date:   Mon, 26 Sep 2022 18:02:13 -0400
From:   Sungwoo Kim <iam@...g-woo.kim>
To:     luiz.dentz@...il.com
Cc:     davem@...emloft.net, edumazet@...gle.com, iam@...g-woo.kim,
        johan.hedberg@...il.com, kuba@...nel.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
        marcel@...tmann.org, netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller@...glegroups.com
Subject: Re: [PATCH] Bluetooth: L2CAP: fix an illegal state transition from BT_DISCONN

Signed-off-by: Sungwoo Kim <iam@...g-woo.kim>
---
 net/bluetooth/l2cap_core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 2c9de67da..029de9f35 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -4294,13 +4294,13 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
 	mutex_lock(&conn->chan_lock);
 
 	if (scid) {
-		chan = __l2cap_get_chan_by_scid(conn, scid);
+		chan = l2cap_get_chan_by_scid(conn, scid);
 		if (!chan) {
 			err = -EBADSLT;
 			goto unlock;
 		}
 	} else {
-		chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
+		chan = l2cap_get_chan_by_ident(conn, cmd->ident);
 		if (!chan) {
 			err = -EBADSLT;
 			goto unlock;
@@ -4336,6 +4336,7 @@ static int l2cap_connect_create_rsp(struct l2cap_conn *conn,
 	}
 
 	l2cap_chan_unlock(chan);
+	l2cap_chan_put(chan);
 
 unlock:
 	mutex_unlock(&conn->chan_lock);
-- 
2.25.1