From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-163.sina.com.cn (smtp153-163.sina.com.cn [61.135.153.163]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B89E274FE3 for ; Mon, 31 Aug 2026 00:38:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.163 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788136730; cv=none; b=Az0kHoMpFf2i64uJtCm1HKutFVVHp6ltJImd6G2QrvPQe+yNeHVuFxGVCfiX9EIhCXR4uHvg5MjUvG77xClEour9dWEifM32lndRgImez6Q7wPzYjceQodK/1xDo/ICdrTkABc7YkOk4NeqZJeGMkenR3C45+6A3plW67UyKfwI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788136730; c=relaxed/simple; bh=hnEqVIHrcpgJxktwQOydaZPVuwv+zAwNBIU8aRTwlKo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AOWoFqcQVaHh7X3TijMjOnEcNnq9JtOPX3nxSnPR/m+VodFOqy7Q9miA9VYkRMFuYvBcyRzeeyOBivFyGiNF3cR2z9SBALEREWgkTVcDBoDbrdQwhnnOLEoaFRGkDrrbY+F92Sv+qsTEPP8XvZ7AwqCXMHpPZZ/lLmZVeKxRr30= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=ImdVvLnm; arc=none smtp.client-ip=61.135.153.163 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="ImdVvLnm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1788136723; bh=sJVWEeKNQndEe3FO2AeKvbwOrYpa0e5bOIBMs4B2Bpg=; h=From:Subject:Date:Message-ID; b=ImdVvLnmBuLR+YEUnd7Nlrg1nW05wnb2ye6o/SB9wi8B4Li86reagyHkTyWWRxUl9 VYYFdincrPIyk3nHWkFVXz8u6h9iWzXpipbxRxTVs3zmn4yXHh7vb7yA3sm8puRrWu TWDAzXwmY7qOjr2KjYy3UuPoItEIrZNToi3osLTY= X-SMAIL-HELO: lxu-ped-host.. Received: from unknown (HELO lxu-ped-host..)([111.198.231.89]) by sina.com (10.54.253.32) with ESMTP id 6A94CD08000053B7; Mon, 31 Aug 2026 08:38:33 +0800 (CST) X-Sender: eadavis@sina.com X-Auth-ID: eadavis@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=eadavis@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=eadavis@sina.com X-SMAIL-MID: 4797804456993 X-SMAIL-UIID: A51647B6DC96479B96DF483E5D60F5ED-20260831-083833-1 From: Edward Adam Davis To: syzbot+5fabc1ae99ff40690d84@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [usb?] KASAN: slab-use-after-free Write in keyspan_close Date: Mon, 31 Aug 2026 08:38:32 +0800 Message-ID: <20260831003832.330549-1-eadavis@sina.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <6a944641.4d659fcc.734b4.003c.GAE@google.com> References: <6a944641.4d659fcc.734b4.003c.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Edward Aadm Davis #syz test: upstream 08dbfad3f504 diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 17edc057a311..0464dbab17c1 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -301,10 +301,19 @@ static void serial_port_shutdown(struct tty_port *tport) struct usb_serial_port *port = container_of(tport, struct usb_serial_port, port); struct usb_serial_driver *drv = port->serial->type; + struct usb_serial *serial = port->serial; + + mutex_lock(&serial->disc_mutex); + if (serial->disconnected) { + mutex_unlock(&serial->disc_mutex); + goto out; + } if (drv->close) drv->close(port); + mutex_unlock(&serial->disc_mutex); +out: usb_autopm_put_interface(port->serial->interface); }