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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DD83C433FE for ; Mon, 24 Jan 2022 20:10:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376947AbiAXUJm (ORCPT ); Mon, 24 Jan 2022 15:09:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60648 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352099AbiAXUDd (ORCPT ); Mon, 24 Jan 2022 15:03:33 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B71AFC08E6E8; Mon, 24 Jan 2022 11:29:45 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 5D1CBB81233; Mon, 24 Jan 2022 19:29:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFF3CC340E5; Mon, 24 Jan 2022 19:29:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1643052584; bh=xvzL5yn66KLTBpJ5XX8WNNkm2PGPKRLw75f8LAXvbiA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eTcCj+afUS6IwDh8lyM20NscVo6f8OqI2YYw04c9HIHJk5eI/8N2a1P0E0fb1tnCa 48ZwfOJy/6bENfcU7q+sDOAf2zeo5YQ1e5FXtijm7hpLMonhfSr6a/FibwJgEbALgi 8irhon6atq9AywiZPQx4GsCrbGtSTIGxBOKlhVYI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= , Jiri Kosina , Sasha Levin Subject: [PATCH 5.4 108/320] HID: hid-uclogic-params: Invalid parameter check in uclogic_params_init Date: Mon, 24 Jan 2022 19:41:32 +0100 Message-Id: <20220124183957.389981862@linuxfoundation.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220124183953.750177707@linuxfoundation.org> References: <20220124183953.750177707@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: stable@vger.kernel.org From: José Expósito [ Upstream commit f364c571a5c77e96de2d32062ff019d6b8d2e2bc ] The function performs a check on its input parameters, however, the hdev parameter is used before the check. Initialize the stack variables after checking the input parameters to avoid a possible NULL pointer dereference. Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module") Addresses-Coverity-ID: 1443831 ("Null pointer dereference") Signed-off-by: José Expósito Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/hid-uclogic-params.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c index ed4ede52b017f..0afd368115891 100644 --- a/drivers/hid/hid-uclogic-params.c +++ b/drivers/hid/hid-uclogic-params.c @@ -832,10 +832,10 @@ int uclogic_params_init(struct uclogic_params *params, struct hid_device *hdev) { int rc; - struct usb_device *udev = hid_to_usb_dev(hdev); - __u8 bNumInterfaces = udev->config->desc.bNumInterfaces; - struct usb_interface *iface = to_usb_interface(hdev->dev.parent); - __u8 bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber; + struct usb_device *udev; + __u8 bNumInterfaces; + struct usb_interface *iface; + __u8 bInterfaceNumber; bool found; /* The resulting parameters (noop) */ struct uclogic_params p = {0, }; @@ -846,6 +846,11 @@ int uclogic_params_init(struct uclogic_params *params, goto cleanup; } + udev = hid_to_usb_dev(hdev); + bNumInterfaces = udev->config->desc.bNumInterfaces; + iface = to_usb_interface(hdev->dev.parent); + bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber; + /* * Set replacement report descriptor if the original matches the * specified size. Otherwise keep interface unchanged. -- 2.34.1