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, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 201B4C433DF for ; Mon, 17 Aug 2020 11:57:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EAF45204EA for ; Mon, 17 Aug 2020 11:57:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727913AbgHQL5r (ORCPT ); Mon, 17 Aug 2020 07:57:47 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:50318 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726151AbgHQL5q (ORCPT ); Mon, 17 Aug 2020 07:57:46 -0400 Received: from DGGEMS407-HUB.china.huawei.com (unknown [172.30.72.60]) by Forcepoint Email with ESMTP id 2189CAE7D8B1F88B5A92; Mon, 17 Aug 2020 19:57:44 +0800 (CST) Received: from huawei.com (10.175.127.227) by DGGEMS407-HUB.china.huawei.com (10.3.19.207) with Microsoft SMTP Server id 14.3.487.0; Mon, 17 Aug 2020 19:57:38 +0800 From: Yu Kuai To: , , , , , , CC: , , , , Subject: [PATCH 1/3] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate() Date: Mon, 17 Aug 2020 19:57:26 +0800 Message-ID: <20200817115728.1706719-2-yukuai3@huawei.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200817115728.1706719-1-yukuai3@huawei.com> References: <20200817115728.1706719-1-yukuai3@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.175.127.227] X-CFilter-Loop: Reflected Sender: dmaengine-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: dmaengine@vger.kernel.org The reurn value of of_find_device_by_node() is not checked, thus null pointer dereference will be triggered if of_find_device_by_node() failed. Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding") Signed-off-by: Yu Kuai --- drivers/dma/at_hdmac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 45bbcd6146fd..1c941f839c42 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -1650,6 +1650,8 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, return NULL; dmac_pdev = of_find_device_by_node(dma_spec->np); + if (!dmac_pdev) + return NULL; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); -- 2.25.4