From patchwork Tue Nov 1 13:13:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Yingliang X-Patchwork-Id: 621022 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 3F329ECAAA1 for ; Tue, 1 Nov 2022 13:16:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229962AbiKANQ0 (ORCPT ); Tue, 1 Nov 2022 09:16:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230207AbiKANQW (ORCPT ); Tue, 1 Nov 2022 09:16:22 -0400 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 28A3563A9 for ; Tue, 1 Nov 2022 06:16:22 -0700 (PDT) Received: from dggpemm500024.china.huawei.com (unknown [172.30.72.54]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4N1r6S20l9zpW0l; Tue, 1 Nov 2022 21:12:48 +0800 (CST) Received: from dggpemm500007.china.huawei.com (7.185.36.183) by dggpemm500024.china.huawei.com (7.185.36.203) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 1 Nov 2022 21:15:55 +0800 Received: from huawei.com (10.175.103.91) by dggpemm500007.china.huawei.com (7.185.36.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Tue, 1 Nov 2022 21:15:54 +0800 From: Yang Yingliang To: CC: , , Daniel Drake , Matt Fleming Subject: [PATCH 3/3] mmc: sdio: fix possible memory leak in mmc_attach_sdio() Date: Tue, 1 Nov 2022 21:13:17 +0800 Message-ID: <20221101131317.866961-4-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221101131317.866961-1-yangyingliang@huawei.com> References: <20221101131317.866961-1-yangyingliang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.103.91] X-ClientProxiedBy: dggems702-chm.china.huawei.com (10.3.19.179) To dggpemm500007.china.huawei.com (7.185.36.183) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org If sdio_add_func() returns error in mmc_attach_sdio(), sdio_remove_func() can not free the memory that allocated in sdio_init_func(), because the sdio function is not presented and sdio_remove_func() will return directly. To fix these leaks, we can call put_device() to give up the reference which was set in device_initialize(), then the memory can be freed in sdio_release_func(). Fixes: 3d10a1ba0d37 ("sdio: fix reference counting in sdio_remove_func()") Cc: Daniel Drake Cc: Matt Fleming Cc: Ulf Hansson Signed-off-by: Yang Yingliang --- drivers/mmc/core/sdio_bus.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/drivers/mmc/core/sdio_bus.c b/drivers/mmc/core/sdio_bus.c index b9308813a226..c4d3f721567e 100644 --- a/drivers/mmc/core/sdio_bus.c +++ b/drivers/mmc/core/sdio_bus.c @@ -379,11 +379,10 @@ int sdio_add_func(struct sdio_func *func) */ void sdio_remove_func(struct sdio_func *func) { - if (!sdio_func_present(func)) - return; - - device_del(&func->dev); - of_node_put(func->dev.of_node); + if (sdio_func_present(func)) { + device_del(&func->dev); + of_node_put(func->dev.of_node); + } put_device(&func->dev); }