From patchwork Wed Jun 7 10:05:40 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 691489 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6CB9C77B7A for ; Wed, 7 Jun 2023 11:17:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234009AbjFGLRG (ORCPT ); Wed, 7 Jun 2023 07:17:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239471AbjFGLRF (ORCPT ); Wed, 7 Jun 2023 07:17:05 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A42641702; Wed, 7 Jun 2023 04:17:04 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3FB5263DBD; Wed, 7 Jun 2023 11:17:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 90665C43442; Wed, 7 Jun 2023 11:17:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1686136623; bh=PqT7b3LTt1IrPaGyiAZXtxPqgt4zXro8Gw7CXf+6hyg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hcwjIfmEFTIUXuUtcgpBMJ4jzU5AmLI03k+n5e24wAmMp/W1YkBJLXXTTEK2axz/9 T5RVxoff/v2jBz79Uir+LB8uZkFWRyks6Q+F30CwBDcQJgIdEyNWW3cIDPa2R4P5RS J6MUJGfI6Q5HqyfmcIrRIak5MNt6+Gi2BtNAXDLaMvzT52dS4jt9jvEjC1v37a5E9e zTdlZJPWBugDtMCH7X3aNaLw8VUD97ukmGLTWHyKuF/02Zq/Zhyl2QX0IQrQjqcdpb euJakyPqO/MwXQV5UurRMzyB6zDzRIo/gm81awExyAXteEMiR11fFc+lkCITXenblb 05+boh6s8h1Bg== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1q6rAM-0008LU-Gz; Wed, 07 Jun 2023 13:17:26 +0200 From: Johan Hovold To: Thinh Nguyen Cc: Greg Kroah-Hartman , Andy Gross , Bjorn Andersson , Konrad Dybcio , Krishna Kurapati , Manivannan Sadhasivam , linux-usb@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org, Li Jun , Sandeep Maheswaram Subject: [PATCH 2/2] USB: dwc3: fix use-after-free on core driver unbind Date: Wed, 7 Jun 2023 12:05:40 +0200 Message-Id: <20230607100540.31045-3-johan+linaro@kernel.org> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20230607100540.31045-1-johan+linaro@kernel.org> References: <20230607100540.31045-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Some dwc3 glue drivers are currently accessing the driver data of the child core device directly, which is clearly a bad idea as the child may not have probed yet or may have been unbound from its driver. As a workaround until the glue drivers have been fixed, clear the driver data pointer before allowing the glue parent device to runtime suspend to prevent its driver from accessing data that has been freed during unbind. Fixes: 6dd2565989b4 ("usb: dwc3: add imx8mp dwc3 glue layer driver") Fixes: 6895ea55c385 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend") Cc: stable@vger.kernel.org # 5.12 Cc: Li Jun Cc: Sandeep Maheswaram Cc: Krishna Kurapati Signed-off-by: Johan Hovold --- drivers/usb/dwc3/core.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 7b2ce013cc5b..d68958e151a7 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -1929,6 +1929,11 @@ static int dwc3_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); + /* + * HACK: Clear the driver data, which is currently accessed by parent + * glue drivers, before allowing the parent to suspend. + */ + platform_set_drvdata(pdev, NULL); pm_runtime_set_suspended(&pdev->dev); dwc3_free_event_buffers(dwc);