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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 96563C4167E for ; Mon, 15 Nov 2021 18:34:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8DA8D632D8 for ; Mon, 15 Nov 2021 18:34:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242437AbhKOSgv (ORCPT ); Mon, 15 Nov 2021 13:36:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:44298 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242320AbhKOSfK (ORCPT ); Mon, 15 Nov 2021 13:35:10 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id E16556346D; Mon, 15 Nov 2021 18:01:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1636999285; bh=S4LCCpzYJLPe4LBP4YPSi1HqUeJ5icw6ybAi5xgnjM8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fBOtNBth+19M2JMHZYqSs+p/ue9f0xd4CQgzUuP3etqL8QS+KN60fJW//cdXuwBWf YfqtUF2OywKpkDCnRg84gMaF2nztu97v9Z3f47m7kHVJf4j4bblbi7uQzkzPQFEP89 Xun5M7IqkJFpkCmR0Rlh3mi1jZQ6qkwoms5GJEqc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dmitriy Ulitin , Alexey Khoroshilov , Sakari Ailus , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.14 241/849] media: stm32: Potential NULL pointer dereference in dcmi_irq_thread() Date: Mon, 15 Nov 2021 17:55:24 +0100 Message-Id: <20211115165428.361328272@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165419.961798833@linuxfoundation.org> References: <20211115165419.961798833@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dmitriy Ulitin [ Upstream commit 548fa43a58696450c15b8f5564e99589c5144664 ] At the moment of enabling irq handling: 1922 ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback, 1923 dcmi_irq_thread, IRQF_ONESHOT, 1924 dev_name(&pdev->dev), dcmi); there is still uninitialized field sd_format of struct stm32_dcmi *dcmi. If an interrupt occurs in the interval between the installation of the interrupt handler and the initialization of this field, NULL pointer dereference happens. This field is dereferenced in the handler function without any check: 457 if (dcmi->sd_format->fourcc == V4L2_PIX_FMT_JPEG && 458 dcmi->misr & IT_FRAME) { The patch moves interrupt handler installation after initialization of the sd_format field that happens in dcmi_graph_notify_complete() via dcmi_set_default_fmt(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Dmitriy Ulitin Signed-off-by: Alexey Khoroshilov Signed-off-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/platform/stm32/stm32-dcmi.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c index d914ccef98317..6110718645a4f 100644 --- a/drivers/media/platform/stm32/stm32-dcmi.c +++ b/drivers/media/platform/stm32/stm32-dcmi.c @@ -128,6 +128,7 @@ struct stm32_dcmi { int sequence; struct list_head buffers; struct dcmi_buf *active; + int irq; struct v4l2_device v4l2_dev; struct video_device *vdev; @@ -1759,6 +1760,14 @@ static int dcmi_graph_notify_complete(struct v4l2_async_notifier *notifier) return ret; } + ret = devm_request_threaded_irq(dcmi->dev, dcmi->irq, dcmi_irq_callback, + dcmi_irq_thread, IRQF_ONESHOT, + dev_name(dcmi->dev), dcmi); + if (ret) { + dev_err(dcmi->dev, "Unable to request irq %d\n", dcmi->irq); + return ret; + } + return 0; } @@ -1914,6 +1923,8 @@ static int dcmi_probe(struct platform_device *pdev) if (irq <= 0) return irq ? irq : -ENXIO; + dcmi->irq = irq; + dcmi->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!dcmi->res) { dev_err(&pdev->dev, "Could not get resource\n"); @@ -1926,14 +1937,6 @@ static int dcmi_probe(struct platform_device *pdev) return PTR_ERR(dcmi->regs); } - ret = devm_request_threaded_irq(&pdev->dev, irq, dcmi_irq_callback, - dcmi_irq_thread, IRQF_ONESHOT, - dev_name(&pdev->dev), dcmi); - if (ret) { - dev_err(&pdev->dev, "Unable to request irq %d\n", irq); - return ret; - } - mclk = devm_clk_get(&pdev->dev, "mclk"); if (IS_ERR(mclk)) { if (PTR_ERR(mclk) != -EPROBE_DEFER) -- 2.33.0