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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 05E92C4361B for ; Tue, 8 Dec 2020 01:51:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0EFA2388C for ; Tue, 8 Dec 2020 01:51:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727451AbgLHBvC (ORCPT ); Mon, 7 Dec 2020 20:51:02 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:8721 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727075AbgLHBvB (ORCPT ); Mon, 7 Dec 2020 20:51:01 -0500 Received: from DGGEMS414-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Cqjm30MXpzkmnk; Tue, 8 Dec 2020 09:49:39 +0800 (CST) Received: from compute.localdomain (10.175.112.70) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server (TLS) id 14.3.487.0; Tue, 8 Dec 2020 09:50:09 +0800 From: Zhang Changzhong To: "David S. Miller" , Jakub Kicinski , Michal Simek , Esben Haabendal CC: Zhang Changzhong , , Subject: [PATCH net] net: ll_temac: Fix potential NULL dereference in temac_probe() Date: Tue, 8 Dec 2020 09:53:42 +0800 Message-ID: <1607392422-20372-1-git-send-email-zhangchangzhong@huawei.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.112.70] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org platform_get_resource() may fail and in this case a NULL dereference will occur. Fix it to use devm_platform_ioremap_resource() instead of calling platform_get_resource() and devm_ioremap(). This is detected by Coccinelle semantic patch. @@ expression pdev, res, n, t, e, e1, e2; @@ res = \(platform_get_resource\|platform_get_resource_byname\)(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2); Fixes: 8425c41d1ef7 ("net: ll_temac: Extend support to non-device-tree platforms") Signed-off-by: Zhang Changzhong --- drivers/net/ethernet/xilinx/ll_temac_main.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/net/ethernet/xilinx/ll_temac_main.c b/drivers/net/ethernet/xilinx/ll_temac_main.c index 60c199f..0301853 100644 --- a/drivers/net/ethernet/xilinx/ll_temac_main.c +++ b/drivers/net/ethernet/xilinx/ll_temac_main.c @@ -1351,7 +1351,6 @@ static int temac_probe(struct platform_device *pdev) struct device_node *temac_np = dev_of_node(&pdev->dev), *dma_np; struct temac_local *lp; struct net_device *ndev; - struct resource *res; const void *addr; __be32 *p; bool little_endian; @@ -1500,13 +1499,11 @@ static int temac_probe(struct platform_device *pdev) of_node_put(dma_np); } else if (pdata) { /* 2nd memory resource specifies DMA registers */ - res = platform_get_resource(pdev, IORESOURCE_MEM, 1); - lp->sdma_regs = devm_ioremap(&pdev->dev, res->start, - resource_size(res)); - if (!lp->sdma_regs) { + lp->sdma_regs = devm_platform_ioremap_resource(pdev, 1); + if (IS_ERR(lp->sdma_regs)) { dev_err(&pdev->dev, "could not map DMA registers\n"); - return -ENOMEM; + return PTR_ERR(lp->sdma_regs); } if (pdata->dma_little_endian) { lp->dma_in = temac_dma_in32_le; -- 2.9.5