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=-5.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS, T_DKIMWL_WL_HIGH,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 8BC0CC04AB1 for ; Thu, 9 May 2019 18:53:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 63203217D7 for ; Thu, 9 May 2019 18:53:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557428028; bh=K7/Z7ULPaiMrGML8CskPhXEpmnsruK7vDzfr3sp2vPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=yYlfdRFXS9pUMi9jZU7inRNHZO9a8TMs3BW9vLRbMV3666EHdCfMuY0E6pCTgoG64 gLTr1Gc72lnqsmA1se1rL1AA/OkxI42prpi3mRmZgZielgxz5clRHQqe/udvcFicbT PcBTEIUyc4z+ft+nAaE0ERfUng9rSdxw9vimdL5k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728665AbfEISxr (ORCPT ); Thu, 9 May 2019 14:53:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:48240 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728927AbfEISxl (ORCPT ); Thu, 9 May 2019 14:53:41 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 8D3CD2177E; Thu, 9 May 2019 18:53:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557428021; bh=K7/Z7ULPaiMrGML8CskPhXEpmnsruK7vDzfr3sp2vPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LPFi0+UfKxLcQ+hEibCH2QwLQ26w9vLPT63JXJxphs47e7bMaSW/b+HTZ15uKrvBx COH6k9ozQG7sjN3iKKhk0NE+f4Hz3NF5mA5HMtis13iSl277Jdg/hpzp7DPMNpBkpi VBrmhlF3Zj25rVl9zHrWxmjRN8i+TDORkZUCo5F8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ross Zwisler , Pierre-Louis Bossart , Mark Brown Subject: [PATCH 5.0 92/95] ASoC: Intel: avoid Oops if DMA setup fails Date: Thu, 9 May 2019 20:42:49 +0200 Message-Id: <20190509181315.648532906@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190509181309.180685671@linuxfoundation.org> References: <20190509181309.180685671@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: Ross Zwisler commit 0efa3334d65b7f421ba12382dfa58f6ff5bf83c4 upstream. Currently in sst_dsp_new() if we get an error return from sst_dma_new() we just print an error message and then still complete the function successfully. This means that we are trying to run without sst->dma properly set up, which will result in NULL pointer dereference when sst->dma is later used. This was happening for me in sst_dsp_dma_get_channel(): struct sst_dma *dma = dsp->dma; ... dma->ch = dma_request_channel(mask, dma_chan_filter, dsp); This resulted in: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: sst_dsp_dma_get_channel+0x4f/0x125 [snd_soc_sst_firmware] Fix this by adding proper error handling for the case where we fail to set up DMA. This change only affects Haswell and Broadwell systems. Baytrail systems explicilty opt-out of DMA via sst->pdata->resindex_dma_base being set to -1. Signed-off-by: Ross Zwisler Cc: stable@vger.kernel.org Acked-by: Pierre-Louis Bossart Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- sound/soc/intel/common/sst-firmware.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/sound/soc/intel/common/sst-firmware.c +++ b/sound/soc/intel/common/sst-firmware.c @@ -1251,11 +1251,15 @@ struct sst_dsp *sst_dsp_new(struct devic goto irq_err; err = sst_dma_new(sst); - if (err) - dev_warn(dev, "sst_dma_new failed %d\n", err); + if (err) { + dev_err(dev, "sst_dma_new failed %d\n", err); + goto dma_err; + } return sst; +dma_err: + free_irq(sst->irq, sst); irq_err: if (sst->ops->free) sst->ops->free(sst);