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=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 E21A2C433DF for ; Thu, 20 Aug 2020 10:04:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B992A22BF3 for ; Thu, 20 Aug 2020 10:04:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917852; bh=Oxz/pHHOfZu6DDktw0jpD77BvgosJPVmTpZamkfr8Jo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jajTPGfEkzlX5siY7SQ1KKll4jJGiA0/DnZlJ+9fD3gSoaWptUT44ICWjjSJdQ9V5 U5EAEWI0K4v8+y8WcYu8OAhkcDwMslw5Agh8Ne8O8chD0i+PncbQz1HS+x7AoP0ZEF wdShUVVu6V7PnTYU5NFL8/OiACaVJXoL4n0Csj7A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728740AbgHTKEB (ORCPT ); Thu, 20 Aug 2020 06:04:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:48252 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730493AbgHTKB6 (ORCPT ); Thu, 20 Aug 2020 06:01:58 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 05D3A22BF5; Thu, 20 Aug 2020 10:01:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917715; bh=Oxz/pHHOfZu6DDktw0jpD77BvgosJPVmTpZamkfr8Jo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yCLsxO6g+PYYs7DORHgHU04yNGehqyFYwI8WSWO3aGAdtIYBlBlFsbBKqkWu1ZT/F 2q8DJwnY+UZSYisefhXJJfeheV8Zay8TBSvSi4O90Qk3JqjFapLaG0TZk9JLakF9HF C5tNyhzMXf44NyB/t38PbxT2NAcHk3ocfeya/pDk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bjorn Helgaas , Bolarinwa Olayemi Saheed , Kalle Valo , Sasha Levin Subject: [PATCH 4.9 101/212] iwlegacy: Check the return value of pcie_capability_read_*() Date: Thu, 20 Aug 2020 11:21:14 +0200 Message-Id: <20200820091607.446726802@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bolarinwa Olayemi Saheed [ Upstream commit 9018fd7f2a73e9b290f48a56b421558fa31e8b75 ] On failure pcie_capability_read_dword() sets it's last parameter, val to 0. However, with Patch 14/14, it is possible that val is set to ~0 on failure. This would introduce a bug because (x & x) == (~0 & x). This bug can be avoided without changing the function's behaviour if the return value of pcie_capability_read_dword is checked to confirm success. Check the return value of pcie_capability_read_dword() to ensure success. Suggested-by: Bjorn Helgaas Signed-off-by: Bolarinwa Olayemi Saheed Signed-off-by: Kalle Valo Link: https://lore.kernel.org/r/20200713175529.29715-3-refactormyself@gmail.com Signed-off-by: Sasha Levin --- drivers/net/wireless/intel/iwlegacy/common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/intel/iwlegacy/common.c b/drivers/net/wireless/intel/iwlegacy/common.c index db2373fe8ac32..55573d090503b 100644 --- a/drivers/net/wireless/intel/iwlegacy/common.c +++ b/drivers/net/wireless/intel/iwlegacy/common.c @@ -4302,8 +4302,8 @@ il_apm_init(struct il_priv *il) * power savings, even without L1. */ if (il->cfg->set_l0s) { - pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl); - if (lctl & PCI_EXP_LNKCTL_ASPM_L1) { + ret = pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl); + if (!ret && (lctl & PCI_EXP_LNKCTL_ASPM_L1)) { /* L1-ASPM enabled; disable(!) L0S */ il_set_bit(il, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED); -- 2.25.1