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=-8.8 required=3.0 tests=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=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 31BF5C43613 for ; Wed, 19 Jun 2019 20:02:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id ED7272082C for ; Wed, 19 Jun 2019 20:02:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="mcVCSvae"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="aQQlsUcm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ED7272082C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=Z6tLJRWKrMfTjjT063aPSyCtl4+qcccqWj+YCGa07eM=; b=mcVCSvaezJJSQ6BlJfPyVcnFyK kMjlL9r7ftlRHLchSAZ9hMVsJvNqvufwSzCDat/Tw5TnE6KtHpYxjmu1+o+ltGV8DYcxa4Icxbixf SzE1WZ6tZPcMI0ye3MXZP221hxZzANYg73E0wVuEbvo+u2ohaxxPGMv8pKSK1Rc1xQyCYiH56OXDJ nyhfjrfMxVymBgpb9XsvcvyA7H7fG8BgusYrmwJjk912vfPdCzLO1dqdFx9/BV7n9TV8tb6wxaWL1 mm5/IQiPVLiX5eLY3H+QPnlpmbHP7Sq/BFRDs2j1ZRRpM/3pRFI6T3Agmb2Ww5bLgnFspcp9jq0pk kCOJ5KVw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hdgnB-0008K1-Ej; Wed, 19 Jun 2019 20:02:49 +0000 Received: from mail-pg1-x544.google.com ([2607:f8b0:4864:20::544]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hdgeR-0006ij-Hf for linux-arm-kernel@lists.infradead.org; Wed, 19 Jun 2019 19:53:51 +0000 Received: by mail-pg1-x544.google.com with SMTP id 196so237601pgc.6 for ; Wed, 19 Jun 2019 12:53:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=eVDBdMkApj9sKJLqD9SjgtJkupY/dvzVE0zp0XjJG6s=; b=aQQlsUcm3Z24V7Z+EWx61qTLfxCs7b7nH/xaftbC8HtMCpQAnLXbjP5yu7nIY3OOMZ CWA74omKQQSUAV5Ys0yftxpQKRXldjo2onAV8EIU3AeQnPuxeON0dECL3ydE1PH09+yY wFbMBOaKWXfcZa3WIbZJ3D5TsMud7z3k4UjsHZ66OSXsfZ9iM3ajIiV84SUQXn6Ol6BM B0PmuDhsYrDLVWCWlPpzCVUaSg+ILgZjjvNe22vx+OJdg1DdY8jB4Vn5Kq/Bwewsp/DQ KVwIbz/z0Gh5FH995SXch8vblMRhaTqGc2mlT4ur0eSw7GXLpK7jNaDAejNCviAW+i+H B2+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=eVDBdMkApj9sKJLqD9SjgtJkupY/dvzVE0zp0XjJG6s=; b=qaoqwF9ItUN3vxfKnW/eGb0WrCBXDrGP8CF0xiLigDvsIhQ56bGxr8bHweuMhXUAJo Z1h8iuQNmStma3DksHmQ+qChl8BZZ7WLeJwWYYMwA2OhcrTzSOvh56AHfSFS5KnkX1EB yHndYeiexN3Jti+Oifa/bmq/W5XPjihTm9x7F1hPMRO3p6HxjZOOmZ4NpOTYwqFBf4xQ eAuizpyq6lN6vlBXRs68QfpxgPRkpKg0QhKNN0h76tC4qiqam2bE+Julcp8ZPn+7VH5t otCJB1ceEqkKuL57AxX10wMouHj2Ik6LdezNTY1aC/WdmTThQXcVShji78xseVRvPBvg UrCg== X-Gm-Message-State: APjAAAWIvuI7T+m2blr3kdFwtm20v+9x+m7gHXBOuvo9YR5vyGt2CZmU U5J1BFpaNKuTiVUxjhqj5s04Eg== X-Google-Smtp-Source: APXvYqynFm4Gi6dwkGLGuDzG63Gvpmx2XwUU8Ox0vdU1H16fpEH0Kdh8q/Dd8SGWkXesbFP8rrtCHA== X-Received: by 2002:a17:90a:214e:: with SMTP id a72mr13374261pje.0.1560974025457; Wed, 19 Jun 2019 12:53:45 -0700 (PDT) Received: from xps15.cg.shawcable.net (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id j14sm21615993pfn.120.2019.06.19.12.53.44 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Jun 2019 12:53:45 -0700 (PDT) From: Mathieu Poirier To: gregkh@linuxfoundation.org Subject: [PATCH 26/28] coresight: tmc: Smatch: Fix potential NULL pointer dereference Date: Wed, 19 Jun 2019 13:53:16 -0600 Message-Id: <20190619195318.19254-27-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190619195318.19254-1-mathieu.poirier@linaro.org> References: <20190619195318.19254-1-mathieu.poirier@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190619_125347_834649_4DE11B68 X-CRM114-Status: GOOD ( 13.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Suzuki K Poulose Based on the following report from Smatch, fix the potential NULL pointer dereference check. The patch 743256e214e8: "coresight: tmc: Clean up device specific data" from May 22, 2019, leads to the following Smatch complaint: drivers/hwtracing/coresight/coresight-tmc-etr.c:625 tmc_etr_free_flat_buf() warn: variable dereferenced before check 'flat_buf' (see line 623) drivers/hwtracing/coresight/coresight-tmc-etr.c 622 struct etr_flat_buf *flat_buf = etr_buf->private; 623 struct device *real_dev = flat_buf->dev->parent; ^^^^^^^^^^ The patch introduces a new NULL check 624 625 if (flat_buf && flat_buf->daddr) ^^^^^^^^ but the existing code assumed it can be NULL. 626 dma_free_coherent(real_dev, flat_buf->size, 627 flat_buf->vaddr, flat_buf->daddr); Cc: Dan Carpenter Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight-tmc-etr.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 5d2bf6d18961..17006705287a 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -620,11 +620,13 @@ static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata, static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf) { struct etr_flat_buf *flat_buf = etr_buf->private; - struct device *real_dev = flat_buf->dev->parent; - if (flat_buf && flat_buf->daddr) + if (flat_buf && flat_buf->daddr) { + struct device *real_dev = flat_buf->dev->parent; + dma_free_coherent(real_dev, flat_buf->size, flat_buf->vaddr, flat_buf->daddr); + } kfree(flat_buf); } -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel