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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE09FC433FE for ; Tue, 10 May 2022 14:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242277AbiEJOEL (ORCPT ); Tue, 10 May 2022 10:04:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54786 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244687AbiEJNmF (ORCPT ); Tue, 10 May 2022 09:42:05 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6926663E3; Tue, 10 May 2022 06:30:25 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 56ED861763; Tue, 10 May 2022 13:30:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D193C385A6; Tue, 10 May 2022 13:30:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1652189423; bh=Y5enQchBqWtPw3dWMTz3w6z5H0ksi/HU71mEpy8zCqA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oj8NDw556+FfubpMIcTwT6U0t7dE4Ub+3LORegS/xVpMueWTUg07t53D4np+HeFea g17cp5j9cJSM4l0bWOsUtHjHzZ4rGk7GCrZUDEDMxvpQzb7FL8sQDKHJicVQj0TGqV 2uEoSSmOoXbz/SUtp86z2eibCNTHqbB4zOIrLE2w= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yang Yingliang , Sven Peter , Joerg Roedel Subject: [PATCH 5.15 047/135] iommu/dart: check return value after calling platform_get_resource() Date: Tue, 10 May 2022 15:07:09 +0200 Message-Id: <20220510130741.748749921@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220510130740.392653815@linuxfoundation.org> References: <20220510130740.392653815@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: Yang Yingliang commit a15932f4377062364d22096afe25bc579134a1c3 upstream. It will cause null-ptr-deref in resource_size(), if platform_get_resource() returns NULL, move calling resource_size() after devm_ioremap_resource() that will check 'res' to avoid null-ptr-deref. And use devm_platform_get_and_ioremap_resource() to simplify code. Fixes: 46d1fb072e76 ("iommu/dart: Add DART iommu driver") Signed-off-by: Yang Yingliang Reviewed-by: Sven Peter Link: https://lore.kernel.org/r/20220425090826.2532165-1-yangyingliang@huawei.com Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/apple-dart.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -832,16 +832,15 @@ static int apple_dart_probe(struct platf dart->dev = dev; spin_lock_init(&dart->lock); - res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dart->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(dart->regs)) + return PTR_ERR(dart->regs); + if (resource_size(res) < 0x4000) { dev_err(dev, "MMIO region too small (%pr)\n", res); return -EINVAL; } - dart->regs = devm_ioremap_resource(dev, res); - if (IS_ERR(dart->regs)) - return PTR_ERR(dart->regs); - dart->irq = platform_get_irq(pdev, 0); if (dart->irq < 0) return -ENODEV;