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

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Message-Id: <20240908000159.2217-1-hdanton@sina.com>
Date: Sun,  8 Sep 2024 08:01:59 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <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)

On Sat, 07 Sep 2024 07:42:26 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    788220eee30d Merge tag 'pm-6.11-rc7' of git://git.kernel.o..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1304189f980000

#syz test

--- l/net/bluetooth/l2cap_core.c
+++ c/net/bluetooth/l2cap_core.c
@@ -1797,6 +1797,7 @@ static void l2cap_conn_del(struct hci_co
 	if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
 		cancel_delayed_work_sync(&conn->info_timer);
 
+	cancel_work_sync(&hcon->hdev->rx_work);
 	hcon->l2cap_data = NULL;
 	conn->hchan = NULL;
 	l2cap_conn_put(conn);
--