From patchwork Wed May 4 06:25:46 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Carpenter X-Patchwork-Id: 9010801 Return-Path: X-Original-To: patchwork-linux-spi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D60149F1D3 for ; Wed, 4 May 2016 06:26:51 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1542B2037C for ; Wed, 4 May 2016 06:26:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24E0620328 for ; Wed, 4 May 2016 06:26:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757209AbcEDG0t (ORCPT ); Wed, 4 May 2016 02:26:49 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:42554 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757189AbcEDG0s (ORCPT ); Wed, 4 May 2016 02:26:48 -0400 Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u446Q0r8009264 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 4 May 2016 06:26:01 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u446Px8u032559 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 4 May 2016 06:26:00 GMT Received: from abhmp0002.oracle.com (abhmp0002.oracle.com [141.146.116.8]) by aserv0121.oracle.com (8.13.8/8.13.8) with ESMTP id u446Ptbj012734; Wed, 4 May 2016 06:25:56 GMT Received: from mwanda (/154.0.139.178) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 03 May 2016 23:25:54 -0700 Date: Wed, 4 May 2016 09:25:46 +0300 From: Dan Carpenter To: Mark Brown , Shawn Lin Cc: Heiko Stuebner , linux-spi@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [patch] spi: rockchip: potential NULL dereference on error Message-ID: <20160504062546.GG22064@mwanda> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) X-Source-IP: aserv0021.oracle.com [141.146.126.233] Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Spam-Status: No, score=-9.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP We were calling dma_release_channel(rs->dma_tx.ch) when "rs->dma_tx.ch" is potentially NULL. There is actually a call to that in the unwind code at the bottom of the function so we can just re-arrange this a bit and remove the call. Also there is no need to set rs->dma_tx.ch to NULL on this error path. Fixes: e4c0e06f949b ('spi: rockchip: fix probe deferral handling') Signed-off-by: Dan Carpenter --- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index 6c6c001..cd89682 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -744,10 +744,8 @@ static int rockchip_spi_probe(struct platform_device *pdev) rs->dma_rx.ch = dma_request_chan(rs->dev, "rx"); if (IS_ERR(rs->dma_rx.ch)) { if (PTR_ERR(rs->dma_rx.ch) == -EPROBE_DEFER) { - dma_release_channel(rs->dma_tx.ch); - rs->dma_tx.ch = NULL; ret = -EPROBE_DEFER; - goto err_get_fifo_len; + goto err_free_dma_tx; } dev_warn(rs->dev, "Failed to request RX DMA channel\n"); rs->dma_rx.ch = NULL; @@ -775,10 +773,11 @@ static int rockchip_spi_probe(struct platform_device *pdev) err_register_master: pm_runtime_disable(&pdev->dev); - if (rs->dma_tx.ch) - dma_release_channel(rs->dma_tx.ch); if (rs->dma_rx.ch) dma_release_channel(rs->dma_rx.ch); +err_free_dma_tx: + if (rs->dma_tx.ch) + dma_release_channel(rs->dma_tx.ch); err_get_fifo_len: clk_disable_unprepare(rs->spiclk); err_spiclk_enable: