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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 48B47C282CD for ; Mon, 28 Jan 2019 16:33:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F66D20663 for ; Mon, 28 Jan 2019 16:33:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548693196; bh=hIsqLgJIVecRCPkiS/x7U8wfvg+g3uWTtxMvbTqZBms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jt5ZCy3U5+y2qF3KnFWmxMikfoCIIIyki0m4UaUZRRPZd4AmL8L0sluwm7jctuTh4 15dboe1qrt/nRPK9TUNsfEPGDEtrsUbuxGJGPQMCQjfMe+2UVc5W4yvR1uzcMJEbGY CsOQgnNZHgEW7MMn93KP7NXWHmSsEU3ysQdpbPg8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390074AbfA1QdO (ORCPT ); Mon, 28 Jan 2019 11:33:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:35896 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390224AbfA1Q0c (ORCPT ); Mon, 28 Jan 2019 11:26:32 -0500 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 6DC132147A; Mon, 28 Jan 2019 16:26:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1548692792; bh=hIsqLgJIVecRCPkiS/x7U8wfvg+g3uWTtxMvbTqZBms=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lVM/3l+bEwb3yt8FcZTe1VOp3o14ZcNDeoVStdxnuZlC5q+ikkRogNQTxvSnhBDHB 4gpOS5bLPqr/UHf3DMi6eKJm4TgaqE8BYhCTkO/z2ZCFnVHgXFt0h2Xxok1aWK1ZSz YIiWEWxvl3GK6Y2Fz10X+9sFnuHBdQ8JBZozSxeY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Colin Ian King , Bjorn Helgaas , Sasha Levin , linux-pci@vger.kernel.org Subject: [PATCH AUTOSEL 3.18 06/61] x86/PCI: Fix Broadcom CNB20LE unintended sign extension (redux) Date: Mon, 28 Jan 2019 11:25:28 -0500 Message-Id: <20190128162623.59854-6-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190128162623.59854-1-sashal@kernel.org> References: <20190128162623.59854-1-sashal@kernel.org> MIME-Version: 1.0 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: Colin Ian King [ Upstream commit 53bb565fc5439f2c8c57a786feea5946804aa3e9 ] In the expression "word1 << 16", word1 starts as u16, but is promoted to a signed int, then sign-extended to resource_size_t, which is probably not what was intended. Cast to resource_size_t to avoid the sign extension. This fixes an identical issue as fixed by commit 0b2d70764bb3 ("x86/PCI: Fix Broadcom CNB20LE unintended sign extension") back in 2014. Detected by CoverityScan, CID#138749, 138750 ("Unintended sign extension") Fixes: 3f6ea84a3035 ("PCI: read memory ranges out of Broadcom CNB20LE host bridge") Signed-off-by: Colin Ian King Signed-off-by: Bjorn Helgaas Signed-off-by: Sasha Levin --- arch/x86/pci/broadcom_bus.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/pci/broadcom_bus.c b/arch/x86/pci/broadcom_bus.c index 526536c81ddc..ca1e8e6dccc8 100644 --- a/arch/x86/pci/broadcom_bus.c +++ b/arch/x86/pci/broadcom_bus.c @@ -50,8 +50,8 @@ static void __init cnb20le_res(u8 bus, u8 slot, u8 func) word1 = read_pci_config_16(bus, slot, func, 0xc0); word2 = read_pci_config_16(bus, slot, func, 0xc2); if (word1 != word2) { - res.start = (word1 << 16) | 0x0000; - res.end = (word2 << 16) | 0xffff; + res.start = ((resource_size_t) word1 << 16) | 0x0000; + res.end = ((resource_size_t) word2 << 16) | 0xffff; res.flags = IORESOURCE_MEM; update_res(info, res.start, res.end, res.flags, 0); } -- 2.19.1