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,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 00EC2C43461 for ; Tue, 8 Sep 2020 18:36:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B760C2080A for ; Tue, 8 Sep 2020 18:36:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599590216; bh=Hu8RKS1W5ophD42Tc/mKCAfGTRnaZgN/HwF9dbizieI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FKCYyBqljvXPkIr5I+7ficOixPLMSJsLj0GiMLbs+BbmgV+W2dTsOyfil1EowPUR+ hqAxQyWsacYX711g3q3xxcmHWPaXqma/pueMkkYTAPZ6Ht6QtqnnMJDEDFTOfnHGq+ P9QBqVEVsuKMZ73tjWvdogRqTXEhkO9DHzo+o/Rw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731831AbgIHSgz (ORCPT ); Tue, 8 Sep 2020 14:36:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:55024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731344AbgIHQJD (ORCPT ); Tue, 8 Sep 2020 12:09:03 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E7EDB24140; Tue, 8 Sep 2020 15:49:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1599580148; bh=Hu8RKS1W5ophD42Tc/mKCAfGTRnaZgN/HwF9dbizieI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bh/EwERhVOTSs/TJeScGhdjh/7snb784inSbS51lKJdbqQHH7KYN2D/VApnqxWRBK beSVr0kTPmq1KYbTBZdQulkTKS507lkWPgFGlxhHO5apm8V2d04ubi/UWqQzoEntlU ZCtizcRtvNVsF1p6kaI8W+DxEDDFOy64xBwGfUWY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Yu Kuai , Vinod Koul , Sasha Levin Subject: [PATCH 4.19 19/88] dmaengine: at_hdmac: check return value of of_find_device_by_node() in at_dma_xlate() Date: Tue, 8 Sep 2020 17:25:20 +0200 Message-Id: <20200908152222.038996527@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908152221.082184905@linuxfoundation.org> References: <20200908152221.082184905@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yu Kuai [ Upstream commit 0cef8e2c5a07d482ec907249dbd6687e8697677f ] 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 Link: https://lore.kernel.org/r/20200817115728.1706719-2-yukuai3@huawei.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- 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 dbc51154f1229..86427f6ba78cb 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -1677,6 +1677,8 @@ 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); -- 2.25.1