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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 1955BC43618 for ; Wed, 12 May 2021 17:13:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0AA9613C5 for ; Wed, 12 May 2021 17:13:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345983AbhELRMh (ORCPT ); Wed, 12 May 2021 13:12:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:47558 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235255AbhELP7X (ORCPT ); Wed, 12 May 2021 11:59:23 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id A0C7261952; Wed, 12 May 2021 15:32:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620833533; bh=nXDLBNMrHYxJwDY+JVZ/Pfhp5PNeJ7cfxZNcM0lP47I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LO4Boc6YHoTfCW+dEkit+AS7uCTgxvOZtq1bUf30nExuazt+4dpvJxaGbTO3kzhQ6 26FpT+77mZLOQdH1MwPXpX1SGexDer9RfBxfvAB9gj1xyd7wLqEYImcurqSu296pvY YltuTE/yZ0xKg3cBEOOh69u+pcGsAX70gsbz7SY4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lukas Wunner , Alain Volmat , Mark Brown , Sasha Levin Subject: [PATCH 5.11 188/601] spi: stm32: Fix use-after-free on unbind Date: Wed, 12 May 2021 16:44:25 +0200 Message-Id: <20210512144834.030504168@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@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: linux-kernel@vger.kernel.org From: Alain Volmat [ Upstream commit 79c6246ae8793448c05da86a4c82298eed8549b0 ] stm32_spi_remove() accesses the driver's private data after calling spi_unregister_master() even though that function releases the last reference on the spi_master and thereby frees the private data. Fix by switching over to the new devm_spi_alloc_master() helper which keeps the private data accessible until the driver has unbound. Fixes: 8d559a64f00b ("spi: stm32: drop devres version of spi_register_master") Reported-by: Lukas Wunner Signed-off-by: Alain Volmat Link: https://lore.kernel.org/r/1616052290-10887-1-git-send-email-alain.volmat@foss.st.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/spi/spi-stm32.c | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c index 8d8a32d46f2d..0318f02d6212 100644 --- a/drivers/spi/spi-stm32.c +++ b/drivers/spi/spi-stm32.c @@ -1830,7 +1830,7 @@ static int stm32_spi_probe(struct platform_device *pdev) struct resource *res; int ret; - master = spi_alloc_master(&pdev->dev, sizeof(struct stm32_spi)); + master = devm_spi_alloc_master(&pdev->dev, sizeof(struct stm32_spi)); if (!master) { dev_err(&pdev->dev, "spi master allocation failed\n"); return -ENOMEM; @@ -1848,18 +1848,16 @@ static int stm32_spi_probe(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); spi->base = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(spi->base)) { - ret = PTR_ERR(spi->base); - goto err_master_put; - } + if (IS_ERR(spi->base)) + return PTR_ERR(spi->base); spi->phys_addr = (dma_addr_t)res->start; spi->irq = platform_get_irq(pdev, 0); - if (spi->irq <= 0) { - ret = dev_err_probe(&pdev->dev, spi->irq, "failed to get irq\n"); - goto err_master_put; - } + if (spi->irq <= 0) + return dev_err_probe(&pdev->dev, spi->irq, + "failed to get irq\n"); + ret = devm_request_threaded_irq(&pdev->dev, spi->irq, spi->cfg->irq_handler_event, spi->cfg->irq_handler_thread, @@ -1867,20 +1865,20 @@ static int stm32_spi_probe(struct platform_device *pdev) if (ret) { dev_err(&pdev->dev, "irq%d request failed: %d\n", spi->irq, ret); - goto err_master_put; + return ret; } spi->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(spi->clk)) { ret = PTR_ERR(spi->clk); dev_err(&pdev->dev, "clk get failed: %d\n", ret); - goto err_master_put; + return ret; } ret = clk_prepare_enable(spi->clk); if (ret) { dev_err(&pdev->dev, "clk enable failed: %d\n", ret); - goto err_master_put; + return ret; } spi->clk_rate = clk_get_rate(spi->clk); if (!spi->clk_rate) { @@ -1976,8 +1974,6 @@ err_dma_release: dma_release_channel(spi->dma_rx); err_clk_disable: clk_disable_unprepare(spi->clk); -err_master_put: - spi_master_put(master); return ret; } -- 2.30.2