From patchwork Wed Feb 9 19:14:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 541644 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 E1399C4332F for ; Wed, 9 Feb 2022 19:17:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229696AbiBITR3 (ORCPT ); Wed, 9 Feb 2022 14:17:29 -0500 Received: from gmail-smtp-in.l.google.com ([23.128.96.19]:50102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233098AbiBITR0 (ORCPT ); Wed, 9 Feb 2022 14:17:26 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 40C26C0F8692; Wed, 9 Feb 2022 11:17:21 -0800 (PST) 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 ams.source.kernel.org (Postfix) with ESMTPS id 0868AB82399; Wed, 9 Feb 2022 19:15:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 382E9C340E7; Wed, 9 Feb 2022 19:15:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644434112; bh=dCxPR4JBeSv02HURTnL42udmBp2yb2pJ1Ew0FokUAEM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kqbuinsX3+4H6y7jzBhRE5piA+qUZMz2QPFsSb9yF+yBp4s3jVive7d657Ww194af Aw43WzAL4SebE7wit/Y/gnEWwzDsiGIhMO2d9dtYwgIuSwz7AUVt8v8Mjfy2po3f6A +ga/dZDC+I+fKL8hmZuZ3hAcTdbcm+EP3EZQ1ySc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ulf Hansson , Xiyu Yang , Xin Xiong , Xin Tan , Tony Lindgren , Yang Li , linux-mmc@vger.kernel.org, whitehat002 Subject: [PATCH 4.19 2/2] moxart: fix potential use-after-free on remove path Date: Wed, 9 Feb 2022 20:14:04 +0100 Message-Id: <20220209191248.685713468@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220209191248.596319706@linuxfoundation.org> References: <20220209191248.596319706@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org From: Greg Kroah-Hartman commit bd2db32e7c3e35bd4d9b8bbff689434a50893546 upstream. It was reported that the mmc host structure could be accessed after it was freed in moxart_remove(), so fix this by saving the base register of the device and using it instead of the pointer dereference. Cc: Ulf Hansson Cc: Xiyu Yang Cc: Xin Xiong Cc: Xin Tan Cc: Tony Lindgren Cc: Yang Li Cc: linux-mmc@vger.kernel.org Cc: stable Reported-by: whitehat002 Signed-off-by: Greg Kroah-Hartman Link: https://lore.kernel.org/r/20220127071638.4057899-1-gregkh@linuxfoundation.org Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/host/moxart-mmc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/mmc/host/moxart-mmc.c +++ b/drivers/mmc/host/moxart-mmc.c @@ -696,12 +696,12 @@ static int moxart_remove(struct platform if (!IS_ERR(host->dma_chan_rx)) dma_release_channel(host->dma_chan_rx); mmc_remove_host(mmc); - mmc_free_host(mmc); writel(0, host->base + REG_INTERRUPT_MASK); writel(0, host->base + REG_POWER_CONTROL); writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF, host->base + REG_CLOCK_CONTROL); + mmc_free_host(mmc); } return 0; }