From patchwork Wed Jun 7 10:05:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 13270478 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 5192CC7EE2F for ; Wed, 7 Jun 2023 11:17:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239908AbjFGLRI (ORCPT ); Wed, 7 Jun 2023 07:17:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52128 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239049AbjFGLRG (ORCPT ); Wed, 7 Jun 2023 07:17:06 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2C0D1BD; 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 36DF763DBA; Wed, 7 Jun 2023 11:17:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 865BFC43444; 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=SWgB+GJxunV8+GIcdNuLA2VAu98d93P4jlBSJxTcTc8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dCocfCn5G6R1dJgV4Mmgd6QmoqMqRFKA44H9gGa/fGqbDWMqfznlnu83eU4rX3cpv 2g3YmLmKhzdK4uBPsKEf5RRJy2gDbmp3VzLjfoipyHazynVJbqidDhMtYqzgdoEmdE hAQSBAK6dLwMOUWcB4LV6Fn39BYBcLwNJUr9X4uiMCKDyZ3UG25cqpgZDhiYHCgV1N qEiiv2znG3AMjklFQRR021NlKqKMNAhGwtv7xM71Bn2dkvgxHcTKYuNAmnD9NWk+8V BX9bCPRAjwtMTs4eSxvQ2DD8l0t1+mWji/1z4wHfAqtoNNTCp0uxrnbgg+6xhe4Wan ZW0mkD4+vxNXQ== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1q6rAM-0008LS-ET; 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, Sandeep Maheswaram Subject: [PATCH 1/2] USB: dwc3: qcom: fix NULL-deref on suspend Date: Wed, 7 Jun 2023 12:05:39 +0200 Message-Id: <20230607100540.31045-2-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 The Qualcomm dwc3 glue driver is currently accessing the driver data of the child core device during suspend and on wakeup interrupts. This is clearly a bad idea as the child may not have probed yet or could have been unbound from its driver. The first such layering violation was part of the initial version of the driver, but this was later made worse when the hack that accesses the driver data of the grand child xhci device to configure the wakeup interrupts was added. Fixing this properly is not that easily done, so add a sanity check to make sure that the child driver data is non-NULL before dereferencing it for now. Note that this relies on subtleties like the fact that driver core is making sure that the parent is not suspended while the child is probing. Reported-by: Manivannan Sadhasivam Link: https://lore.kernel.org/all/20230325165217.31069-4-manivannan.sadhasivam@linaro.org/ Fixes: d9152161b4bf ("usb: dwc3: Add Qualcomm DWC3 glue layer driver") Fixes: 6895ea55c385 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend") Cc: stable@vger.kernel.org # 3.18: a872ab303d5d: "usb: dwc3: qcom: fix use-after-free on runtime-PM wakeup" Cc: Sandeep Maheswaram Cc: Krishna Kurapati Signed-off-by: Johan Hovold Reviewed-by: Manivannan Sadhasivam Acked-by: Thinh Nguyen --- drivers/usb/dwc3/dwc3-qcom.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c index 959fc925ca7c..79b22abf9727 100644 --- a/drivers/usb/dwc3/dwc3-qcom.c +++ b/drivers/usb/dwc3/dwc3-qcom.c @@ -308,7 +308,16 @@ static void dwc3_qcom_interconnect_exit(struct dwc3_qcom *qcom) /* Only usable in contexts where the role can not change. */ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom) { - struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3); + struct dwc3 *dwc; + + /* + * FIXME: Fix this layering violation. + */ + dwc = platform_get_drvdata(qcom->dwc3); + + /* Core driver may not have probed yet. */ + if (!dwc) + return false; return dwc->xhci; }