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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 9BF12C433E1 for ; Mon, 10 Aug 2020 19:18:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6DF302080C for ; Mon, 10 Aug 2020 19:18:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597087094; bh=uRyO4yW0oWApsXVUw1zk0cQsJJLPndkA72/KstVeyrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JNjr2iACosDN4xupwsS9nMPi2E4nQ04BVRjVcmsD0Z1vHjkK0XDdGFpSfuqTIkfiP JtPzgBQvDpCTHByUHCfDfmTmz0THWi9/DSkJDN0YjRDTsoDZSf9knY6MOxv6AAzkup Fn2jtqoGoLsQuJyCfVHQkasEj+Qxq/EhnXKcOW6c= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729981AbgHJTSN (ORCPT ); Mon, 10 Aug 2020 15:18:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:45920 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729948AbgHJTOG (ORCPT ); Mon, 10 Aug 2020 15:14:06 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 98F18207FF; Mon, 10 Aug 2020 19:14:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597086845; bh=uRyO4yW0oWApsXVUw1zk0cQsJJLPndkA72/KstVeyrY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yp0Z9Gq2oUWg+RHjJINRBxr1PWxyMuu5UaFyiGI/2GavsrSG3K6KQLm3cCZn8PfVr WibtizRpyCSuMZ67j5rLM07oLEPbi82IwDHba5z+ErSBw+Hsu8ceo6zehjco5eFwD2 5lTTwnbDVgN41VgB4OI2hjXZQDR59tdJ99LoAfTA= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bolarinwa Olayemi Saheed , Bjorn Helgaas , Kalle Valo , Sasha Levin , linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 14/22] iwlegacy: Check the return value of pcie_capability_read_*() Date: Mon, 10 Aug 2020 15:13:36 -0400 Message-Id: <20200810191345.3795166-14-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200810191345.3795166-1-sashal@kernel.org> References: <20200810191345.3795166-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore 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 6e6b124f0d5e3..3ca84577803cc 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