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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF40EC46467 for ; Mon, 16 Jan 2023 17:02:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234174AbjAPRCU (ORCPT ); Mon, 16 Jan 2023 12:02:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54840 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231732AbjAPRBx (ORCPT ); Mon, 16 Jan 2023 12:01:53 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0606839B92 for ; Mon, 16 Jan 2023 08:43:46 -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 AD576B8105D for ; Mon, 16 Jan 2023 16:43:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FDE2C433EF; Mon, 16 Jan 2023 16:43:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1673887423; bh=s34urJdZzzJkItwQr4GHko8e3HXMnfpnVhbCltDnNtA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rFUv5HJxge0JZL8BDdeVSjicWEFaBxwnb12VwUSzz26TX32FwodioQESJ0iPh7lVN NwVJu5JpXzgTiGBlfT7pXk9z0EwVGsMq2lig/LoGus2gjiMuo8Juxp+liJqNHPNt0n N93oXbVUXwYvX0oLgfw6J6w29y/W3zYw5cTZYOI8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yang Yingliang , Ulf Hansson , Sasha Levin Subject: [PATCH 4.19 144/521] mmc: via-sdmmc: fix return value check of mmc_add_host() Date: Mon, 16 Jan 2023 16:46:46 +0100 Message-Id: <20230116154853.719619811@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230116154847.246743274@linuxfoundation.org> References: <20230116154847.246743274@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Yang Yingliang [ Upstream commit e4e46fb61e3bb4628170810d3f2b996b709b90d9 ] mmc_add_host() may return error, if we ignore its return value, it will lead two issues: 1. The memory that allocated in mmc_alloc_host() is leaked. 2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del(). Fix this by checking the return value and goto error path which will call mmc_free_host(). Fixes: f0bf7f61b840 ("mmc: Add new via-sdmmc host controller driver") Signed-off-by: Yang Yingliang Link: https://lore.kernel.org/r/20221108130949.1067699-1-yangyingliang@huawei.com Signed-off-by: Ulf Hansson Signed-off-by: Sasha Levin --- drivers/mmc/host/via-sdmmc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/via-sdmmc.c b/drivers/mmc/host/via-sdmmc.c index 1b66466d2ed4..b78e96b5289b 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1166,7 +1166,9 @@ static int via_sd_probe(struct pci_dev *pcidev, pcidev->subsystem_device == 0x3891) sdhost->quirks = VIA_CRDR_QUIRK_300MS_PWRDELAY; - mmc_add_host(mmc); + ret = mmc_add_host(mmc); + if (ret) + goto unmap; return 0; -- 2.35.1