From patchwork Wed Jan 5 17:29:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= X-Patchwork-Id: 12704552 X-Patchwork-Delegate: jikos@jikos.cz 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 F1C5FC433EF for ; Wed, 5 Jan 2022 17:29:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242262AbiAER30 (ORCPT ); Wed, 5 Jan 2022 12:29:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55096 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242235AbiAER3Z (ORCPT ); Wed, 5 Jan 2022 12:29:25 -0500 Received: from mail-wm1-x336.google.com (mail-wm1-x336.google.com [IPv6:2a00:1450:4864:20::336]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E405C061245; Wed, 5 Jan 2022 09:29:25 -0800 (PST) Received: by mail-wm1-x336.google.com with SMTP id g191-20020a1c9dc8000000b0032fbf912885so3710647wme.4; Wed, 05 Jan 2022 09:29:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=76j/vBihwnF+1b+6Vi7Z9v34SJGyorcIi5qbktRYn7M=; b=PAiO7xpn9cR7fCzoh02uoNu36k52dnHGWus+w9e1kg0BKjaLo7XMfT7m5jv7Vo0yOi bCZIMCWQ5KKv4HuNuI/jTaI3jt/C2eKTuvh2YnpM1sO2FAI/LIMCA2S3pWHU6DkJlv6W 3vLph53A9mVICKhb5zw3IA9806wY+zORKlPH0Tx4xP+W8QbTWCa/CvFnmiGljjKrtivF NBmrHTPVinfq2oZKPDi6kT3et5vq62LiEcV5Ty82Nn627VgiVbLTvTKHwz7+5Zh4a6f+ vsSY3db0oZW3ufUAaYjFl3qxL7MLKdY8TyKvaEL+xPkCH05VaCyBDQYC7//lZChVXx8+ fAjw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=76j/vBihwnF+1b+6Vi7Z9v34SJGyorcIi5qbktRYn7M=; b=7lFdVKHGpgydTeg1QVkLq6X2YUmtJKQ8eyqkTLjAJyJXAvZ2OMVTe0XmwoLxOQ4nEQ HNaf92gp5DqDAq5XeID/iKblQEpyzk5zgsw6waHXWQ5E9Hu5/Ann/3GvLxJq//f7hcex +8OmDn9G8qmt6NQiw22wxrbzNnnHECn/JS5tI6yhMHT3XBnmaIKwZicm0Zc4znOqz9gR xlws2EM8cd+jAdcq3/kRx+Te1Y9A1lLLFAe6Ia8iPxon4dlvlcOyXz0u9t28h13z8OY0 d23ylfdSNh01UYOLPy8uU/lC+a+CaPPJB/kIH+rzm5MveG4wsARybRvEclKfQXLjwoY2 OPaQ== X-Gm-Message-State: AOAM533cl8n1NnVhBxoSNq46UOrlyucCF8AJveJn/NPUtMvNHgIfDdNl eL2mhYK3FBHA0UX4tPMjqYY= X-Google-Smtp-Source: ABdhPJxpJk51idyGNT2hPNI07YNoQmi5SEQ2ysX1wo3u1Q7fD5HPriWyw04A1WGVm7cTWAzToPKomA== X-Received: by 2002:a1c:a747:: with SMTP id q68mr2491100wme.98.1641403763651; Wed, 05 Jan 2022 09:29:23 -0800 (PST) Received: from localhost.localdomain ([217.113.240.86]) by smtp.gmail.com with ESMTPSA id g6sm43071442wri.67.2022.01.05.09.29.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Jan 2022 09:29:23 -0800 (PST) From: =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= To: jikos@kernel.org Cc: benjamin.tissoires@redhat.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, spbnick@gmail.com, =?utf-8?b?Sm9zw6kgRXhww7Nz?= =?utf-8?b?aXRv?= Subject: [PATCH 1/4] HID: hid-uclogic-params: Invalid parameter check in uclogic_params_init Date: Wed, 5 Jan 2022 18:29:12 +0100 Message-Id: <20220105172915.131091-2-jose.exposito89@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220105172915.131091-1-jose.exposito89@gmail.com> References: <20220105172915.131091-1-jose.exposito89@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org 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 --- 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 adff1bd68d9f..3c10b858cf74 100644 --- a/drivers/hid/hid-uclogic-params.c +++ b/drivers/hid/hid-uclogic-params.c @@ -834,10 +834,10 @@ 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, }; @@ -848,6 +848,11 @@ 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.