linux-kernel - Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap

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Message-ID: <tencent_4264A96683BCC4583779976346D633660305@qq.com>
Date: Sun,  8 Sep 2024 10:06:22 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+c12e2f941af1feb5632c@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] KASAN: slab-use-after-free Read in l2cap_connect (2)

after release conn, we need to cancle rx_work

#syz test

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 8e48ccd2af30..5050d20e9cd1 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -1264,6 +1264,7 @@ void hci_conn_failed(struct hci_conn *conn, u8 status)
 	conn->state = BT_CLOSED;
 	hci_connect_cfm(conn, status);
 	hci_conn_del(conn);
+	cancel_work_sync(&hdev->rx_work);
 }
 
 /* This function requires the caller holds hdev->lock */