From patchwork Wed Feb 9 19:13:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 541643 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 11B9BC433F5 for ; Wed, 9 Feb 2022 19:26:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233074AbiBIT02 (ORCPT ); Wed, 9 Feb 2022 14:26:28 -0500 Received: from gmail-smtp-in.l.google.com ([23.128.96.19]:46152 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234385AbiBIT0I (ORCPT ); Wed, 9 Feb 2022 14:26:08 -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 049D5C102FED; Wed, 9 Feb 2022 11:19:55 -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 5C3DEB8238C; Wed, 9 Feb 2022 19:14:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C001C340E7; Wed, 9 Feb 2022 19:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1644434092; bh=eoZDwWkV4rsrAJOY5F0LAs5kTxbQ7KPvapYjwLwSSJI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kEi4yUF0j+4L2R7nkzZenYZutTMROVoJH+mMSQYop0n9IQFzvo6F2PAOTCsmbOrxf d7Wj+PUuuR3EYo3YlCcJJALAnj10VbXMvVpvCVcW8zg5VelhDKsgpU/+tEQfEfox0f nQO7lcjw4dXIuKbyKihcJegDtcw5kK2pKGMxnxvg= 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 4.9 2/2] moxart: fix potential use-after-free on remove path Date: Wed, 9 Feb 2022 20:13:33 +0100 Message-Id: <20220209191247.913724368@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220209191247.830371456@linuxfoundation.org> References: <20220209191247.830371456@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 @@ -698,12 +698,12 @@ 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; }