From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 611FFC433EF for ; Mon, 27 Sep 2021 17:04:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4C890611CE for ; Mon, 27 Sep 2021 17:04:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235940AbhI0RG0 (ORCPT ); Mon, 27 Sep 2021 13:06:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:45116 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235804AbhI0RGD (ORCPT ); Mon, 27 Sep 2021 13:06:03 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id BB7666113D; Mon, 27 Sep 2021 17:04:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632762265; bh=P05baZsuVmGrScDKFghEoeFNrTjuLwQh/67Nmgt0fSg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I2rNSXxXLnYklm9hLdturQQq2j2xB3zhDKuSuB1LzSUsgr4xxkyev/gBU6blGBkeX F8wFyMWDeL4+bLS8uxEpPQ1LQcOKoASuO7VC1rRHkqhu91tywZiJap7w9sjow5o0+E LKn0vs1OFZnyDTb0E5J+fvfyhgmW46tM1Y79RY7A= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Johan Hovold , "David S. Miller" Subject: [PATCH 5.4 24/68] net: hso: fix muxed tty registration Date: Mon, 27 Sep 2021 19:02:20 +0200 Message-Id: <20210927170220.791697034@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210927170219.901812470@linuxfoundation.org> References: <20210927170219.901812470@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Johan Hovold commit e8f69b16ee776da88589b5271e3f46020efc8f6c upstream. If resource allocation and registration fail for a muxed tty device (e.g. if there are no more minor numbers) the driver should not try to deregister the never-registered (or already-deregistered) tty. Fix up the error handling to avoid dereferencing a NULL pointer when attempting to remove the character device. Fixes: 72dc1c096c70 ("HSO: add option hso driver") Cc: stable@vger.kernel.org # 2.6.27 Signed-off-by: Johan Hovold Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/hso.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -2704,14 +2704,14 @@ struct hso_device *hso_create_mux_serial serial = kzalloc(sizeof(*serial), GFP_KERNEL); if (!serial) - goto exit; + goto err_free_dev; hso_dev->port_data.dev_serial = serial; serial->parent = hso_dev; if (hso_serial_common_create (serial, 1, CTRL_URB_RX_SIZE, CTRL_URB_TX_SIZE)) - goto exit; + goto err_free_serial; serial->tx_data_length--; serial->write_data = hso_mux_serial_write_data; @@ -2727,11 +2727,9 @@ struct hso_device *hso_create_mux_serial /* done, return it */ return hso_dev; -exit: - if (serial) { - tty_unregister_device(tty_drv, serial->minor); - kfree(serial); - } +err_free_serial: + kfree(serial); +err_free_dev: kfree(hso_dev); return NULL;