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=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 5E44CC433E6 for ; Mon, 1 Mar 2021 23:13:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 28C5C60230 for ; Mon, 1 Mar 2021 23:13:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239020AbhCAXGm (ORCPT ); Mon, 1 Mar 2021 18:06:42 -0500 Received: from mail.kernel.org ([198.145.29.99]:49650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236421AbhCARyE (ORCPT ); Mon, 1 Mar 2021 12:54:04 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1326965356; Mon, 1 Mar 2021 17:45:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614620718; bh=aVAObzpKYvgk2U20BrBMekk0Q8E7V+FDo8jk51viFRw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wjb+dOgArXGURrLEfMTBz+SrZm8BTRY9zO409JYALE+3cZ5eNcc43e2UIjA8DLIPJ 2nl74GILva4a+zpY5Fw8ejQfxoFqNEjwchQXT1VTFJsHibEZOS4FmvV13quJ/f4Daq WPidCG7fF/ASmVWC8Y9j5ufRIukAjtqR4ZWTvFd4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Alex Deucher , Sasha Levin Subject: [PATCH 5.11 254/775] drm/amdgpu: Prevent shift wrapping in amdgpu_read_mask() Date: Mon, 1 Mar 2021 17:07:02 +0100 Message-Id: <20210301161214.184953063@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161201.679371205@linuxfoundation.org> References: <20210301161201.679371205@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 c915ef890d5dc79f483e1ca3b3a5b5f1a170690c ] If the user passes a "level" value which is higher than 31 then that leads to shift wrapping. The undefined behavior will lead to a syzkaller stack dump. Fixes: 5632708f4452 ("drm/amd/powerplay: add dpm force multiple levels on cz/tonga/fiji/polaris (v2)") Signed-off-by: Dan Carpenter Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- drivers/gpu/drm/amd/pm/amdgpu_pm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/amd/pm/amdgpu_pm.c b/drivers/gpu/drm/amd/pm/amdgpu_pm.c index 7b6ef05a1d35a..0b5be50b2eeeb 100644 --- a/drivers/gpu/drm/amd/pm/amdgpu_pm.c +++ b/drivers/gpu/drm/amd/pm/amdgpu_pm.c @@ -1074,7 +1074,7 @@ static ssize_t amdgpu_get_pp_dpm_sclk(struct device *dev, static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask) { int ret; - long level; + unsigned long level; char *sub_str = NULL; char *tmp; char buf_cpy[AMDGPU_MASK_BUF_MAX + 1]; @@ -1090,8 +1090,8 @@ static ssize_t amdgpu_read_mask(const char *buf, size_t count, uint32_t *mask) while (tmp[0]) { sub_str = strsep(&tmp, delimiter); if (strlen(sub_str)) { - ret = kstrtol(sub_str, 0, &level); - if (ret) + ret = kstrtoul(sub_str, 0, &level); + if (ret || level > 31) return -EINVAL; *mask |= 1 << level; } else -- 2.27.0