linux-kernel - Re: [syzbot] [bluetooth?] general protection fault in bcsp

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Message-ID: <20250630080413.2136-1-hdanton@sina.com>
Date: Mon, 30 Jun 2025 16:03:57 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+4ed6852d4da4606c93da@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] general protection fault in bcsp_recv

> Date: Wed, 02 Apr 2025 16:56:20 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    acc4d5ff0b61 Merge tag 'net-6.15-rc0' of git://git.kernel...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=135a6178580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=410c49aba9aeb859
> dashboard link: https://syzkaller.appspot.com/bug?extid=4ed6852d4da4606c93da
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=134ec7cf980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13315274580000

#syz test

--- x/drivers/bluetooth/hci_ldisc.c
+++ y/drivers/bluetooth/hci_ldisc.c
@@ -615,7 +615,7 @@ static void hci_uart_tty_receive(struct
 
 	percpu_down_read(&hu->proto_lock);
 
-	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) &&
+	if (!test_bit(HCI_UART_PROTO_READY, &hu->flags) ||
 	    !test_bit(HCI_UART_PROTO_INIT, &hu->flags)) {
 		percpu_up_read(&hu->proto_lock);
 		return;
--