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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1550DC388F9 for ; Tue, 27 Oct 2020 14:35:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BFCEB22281 for ; Tue, 27 Oct 2020 14:35:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603809333; bh=uNmru5R0McIAqb9hfvtQsK/oLYb6tyNGhNhQux/IUJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KHCFMBMH3Gzhelvg/ovsSU3X8pXp/DlDDD4iW1gOadOZr+y1axmb7VcGM10CeRCgt RyvQJI5NCIs/+iwguHCOcZe9nHaRXXQ7oKn531WxncZ0RDy0FlII32QXBhPdPqhF76 MDiLYKSjJI12cj7NNOFqPzwjXc3F05PgLvUr/7T8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760621AbgJ0Ofb (ORCPT ); Tue, 27 Oct 2020 10:35:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:33474 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760327AbgJ0Oek (ORCPT ); Tue, 27 Oct 2020 10:34:40 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 41E91207BB; Tue, 27 Oct 2020 14:34:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603809278; bh=uNmru5R0McIAqb9hfvtQsK/oLYb6tyNGhNhQux/IUJc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IXGnIyOsCpBBOWhjGXqKLFOMBBZzuGuerQvP04sx+JkuOtRlSejbhdyVylibtkfIn iId81kWnLa7Keonnbxi5+hkPEGqJDp4sG116svpFt7aPgmKFUpK0gu1yXhNIC1Oc01 Z8u9nJ1WkDDqHem16e5FtSlD0SWGluiXZezUVgcA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Jiri Kosina , Sasha Levin Subject: [PATCH 5.4 139/408] HID: roccat: add bounds checking in kone_sysfs_write_settings() Date: Tue, 27 Oct 2020 14:51:17 +0100 Message-Id: <20201027135501.548173207@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135455.027547757@linuxfoundation.org> References: <20201027135455.027547757@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: Dan Carpenter [ Upstream commit d4f98dbfe717490e771b6e701904bfcf4b4557f0 ] This code doesn't check if "settings->startup_profile" is within bounds and that could result in an out of bounds array access. What the code does do is it checks if the settings can be written to the firmware, so it's possible that the firmware has a bounds check? It's safer and easier to verify when the bounds checking is done in the kernel. Fixes: 14bf62cde794 ("HID: add driver for Roccat Kone gaming mouse") Signed-off-by: Dan Carpenter Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/hid-roccat-kone.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c index 1a6e600197d0b..509b9bb1362cb 100644 --- a/drivers/hid/hid-roccat-kone.c +++ b/drivers/hid/hid-roccat-kone.c @@ -294,31 +294,40 @@ static ssize_t kone_sysfs_write_settings(struct file *fp, struct kobject *kobj, struct kone_device *kone = hid_get_drvdata(dev_get_drvdata(dev)); struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev)); int retval = 0, difference, old_profile; + struct kone_settings *settings = (struct kone_settings *)buf; /* I need to get my data in one piece */ if (off != 0 || count != sizeof(struct kone_settings)) return -EINVAL; mutex_lock(&kone->kone_lock); - difference = memcmp(buf, &kone->settings, sizeof(struct kone_settings)); + difference = memcmp(settings, &kone->settings, + sizeof(struct kone_settings)); if (difference) { - retval = kone_set_settings(usb_dev, - (struct kone_settings const *)buf); - if (retval) { - mutex_unlock(&kone->kone_lock); - return retval; + if (settings->startup_profile < 1 || + settings->startup_profile > 5) { + retval = -EINVAL; + goto unlock; } + retval = kone_set_settings(usb_dev, settings); + if (retval) + goto unlock; + old_profile = kone->settings.startup_profile; - memcpy(&kone->settings, buf, sizeof(struct kone_settings)); + memcpy(&kone->settings, settings, sizeof(struct kone_settings)); kone_profile_activated(kone, kone->settings.startup_profile); if (kone->settings.startup_profile != old_profile) kone_profile_report(kone, kone->settings.startup_profile); } +unlock: mutex_unlock(&kone->kone_lock); + if (retval) + return retval; + return sizeof(struct kone_settings); } static BIN_ATTR(settings, 0660, kone_sysfs_read_settings, -- 2.25.1