From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 762CA8494 for ; Thu, 5 Jan 2023 13:00:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF50FC4339E; Thu, 5 Jan 2023 13:00:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1672923648; bh=sakuD3OsrfqoYVlVe9GddtrvT4csQeKMwH/1qJj18Hg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qbYE/lSDRNlwAIY2Z5cP/bOAzogePa+1x6xweANTahvKykyscKmClWYfGumvQcebv WwO+gpJGssr2CQNClRepx6QjYXL9q9x3uHdOg87X7OmB79BIEuj7GNpHTaliiOQXPi J5ojDJj1/zGwjyQKzBwCV41hiblpSwxT0BWSd37Y= 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 4.9 087/251] mmc: via-sdmmc: fix return value check of mmc_add_host() Date: Thu, 5 Jan 2023 13:53:44 +0100 Message-Id: <20230105125338.787751251@linuxfoundation.org> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230105125334.727282894@linuxfoundation.org> References: <20230105125334.727282894@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 a3472127bea3..74ac1ac55f42 100644 --- a/drivers/mmc/host/via-sdmmc.c +++ b/drivers/mmc/host/via-sdmmc.c @@ -1162,7 +1162,9 @@ 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