From patchwork Wed Feb 2 15:08:54 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haris Iqbal X-Patchwork-Id: 12733150 X-Patchwork-Delegate: jgg@ziepe.ca 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 59D82C433EF for ; Wed, 2 Feb 2022 15:09:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244287AbiBBPJB (ORCPT ); Wed, 2 Feb 2022 10:09:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240866AbiBBPJA (ORCPT ); Wed, 2 Feb 2022 10:09:00 -0500 Received: from mail-ed1-x535.google.com (mail-ed1-x535.google.com [IPv6:2a00:1450:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3CA0DC061714 for ; Wed, 2 Feb 2022 07:09:00 -0800 (PST) Received: by mail-ed1-x535.google.com with SMTP id b13so42930739edn.0 for ; Wed, 02 Feb 2022 07:09:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ionos.com; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=zgHkq3DvZny3BNar3jH1ignKEJ8NNiVYfZeGPSxh2XU=; b=D5y/AJCQt/91dyAYP3/+P2FFHzMvYvOQqZk2JpEvjnxMtNmxfPfwIWcj1OrnkslkMh 9SByC04LZKkca88M+wpf0dsiw9EHi8rDY/RxRkcT99Dv6RoljSV05Um2e9ifM2aIeDn2 AoHk0jPrwnFFsKKdRmbFlrAK9k1upcCiFLPY0WMCinhQryK1Mz8H9GRwfPvUyO1/g/HL pIRzcRRQiKmWWTUXBUrSr9Vb/d9z6OPkibCbT9E6lPV6FseFh2IkWJ7q8/CKanL6G3fg cTcpVhbes1phMw5NRYtSsvmQn4p5tHZBbIBZo6oQLXsBOsbCkOT0pRCPwsKWJezBvs5O Jihg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=zgHkq3DvZny3BNar3jH1ignKEJ8NNiVYfZeGPSxh2XU=; b=h0PqQYYy4jemNazJ7iPUi75ZFr+o73zS0DTPYf2cQFwnwHU4v5zADSyT6cvxNWg1eS EWTuQYiCiE5jGP0tilQ6TYdbCa1yd3XvLH/um5f2WzmWJ34WNP92k2QBxl5uitSJVGsd ag+SP/sEm0jnHf5OoxCKPBufwubHqHiMfIaqIl/xc3BOSSiZD22Ryn32rzb+QzlkfxhS f2+uo8gvWiw1XAuPIwYyokocB8Vlo/M4vGIgwDqbaS9+gsO/PpHjeaJ/2NSN/O6SiXMN hqqRnFF/lH9YUWHHn7r7VQm8KRJ2VlzW8AR/LaXrVr9mrXPkSUNoSkRpZmV+P9eM5JIK vNBg== X-Gm-Message-State: AOAM533rOEyS/OZnvneJ/qS904dn5shCsu1IFSelymS9iOfWvlV/5+Yg elS7kOnitz4AMDcaHK2wpI/wCwvrwt/Cbw== X-Google-Smtp-Source: ABdhPJzdt+Aa0QYLljtslxdxbq9TNPLtkkemwKgwzhm2fyrG/TWq88hkFyF1I+A60RYuCDCQ3Qgb9w== X-Received: by 2002:aa7:cdc5:: with SMTP id h5mr30667602edw.293.1643814538772; Wed, 02 Feb 2022 07:08:58 -0800 (PST) Received: from lb01533.fkb.profitbricks.net ([85.214.13.132]) by smtp.gmail.com with ESMTPSA id j19sm4883625ejm.111.2022.02.02.07.08.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Feb 2022 07:08:58 -0800 (PST) From: Md Haris Iqbal To: linux-rdma@vger.kernel.org Cc: bvanassche@acm.org, leon@kernel.org, jgg@ziepe.ca, haris.iqbal@ionos.com, jinpu.wang@ionos.com Subject: [PATCH v3 1/2] RDMA/rtrs-clt: Fix possible double free in error case Date: Wed, 2 Feb 2022 16:08:54 +0100 Message-Id: <20220202150855.445973-1-haris.iqbal@ionos.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org Callback function rtrs_clt_dev_release() for put_device() calls kfree(clt) to free memory. We shouldn't call kfree(clt) again, and we can't use the clt after kfree too. Replace device_register with device_initialize and device_add so that dev_set_name can be used appropriately. Move mutex_destroy to release function so it can be called in alloc_clt err path. Signed-off-by: Md Haris Iqbal Reviewed-by: Jack Wang --- drivers/infiniband/ulp/rtrs/rtrs-clt.c | 37 ++++++++++++++------------ 1 file changed, 20 insertions(+), 17 deletions(-) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c index b696aa4abae4..d20bad345eff 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c @@ -2685,6 +2685,8 @@ static void rtrs_clt_dev_release(struct device *dev) struct rtrs_clt_sess *clt = container_of(dev, struct rtrs_clt_sess, dev); + mutex_destroy(&clt->paths_ev_mutex); + mutex_destroy(&clt->paths_mutex); kfree(clt); } @@ -2714,6 +2716,8 @@ static struct rtrs_clt_sess *alloc_clt(const char *sessname, size_t paths_num, return ERR_PTR(-ENOMEM); } + clt->dev.class = rtrs_clt_dev_class; + clt->dev.release = rtrs_clt_dev_release; uuid_gen(&clt->paths_uuid); INIT_LIST_HEAD_RCU(&clt->paths_list); clt->paths_num = paths_num; @@ -2730,43 +2734,41 @@ static struct rtrs_clt_sess *alloc_clt(const char *sessname, size_t paths_num, init_waitqueue_head(&clt->permits_wait); mutex_init(&clt->paths_ev_mutex); mutex_init(&clt->paths_mutex); + device_initialize(&clt->dev); - clt->dev.class = rtrs_clt_dev_class; - clt->dev.release = rtrs_clt_dev_release; err = dev_set_name(&clt->dev, "%s", sessname); if (err) - goto err; + goto err_put; + /* * Suppress user space notification until * sysfs files are created */ dev_set_uevent_suppress(&clt->dev, true); - err = device_register(&clt->dev); - if (err) { - put_device(&clt->dev); - goto err; - } + err = device_add(&clt->dev); + if (err) + goto err_put; clt->kobj_paths = kobject_create_and_add("paths", &clt->dev.kobj); if (!clt->kobj_paths) { err = -ENOMEM; - goto err_dev; + goto err_del; } err = rtrs_clt_create_sysfs_root_files(clt); if (err) { kobject_del(clt->kobj_paths); kobject_put(clt->kobj_paths); - goto err_dev; + goto err_del; } dev_set_uevent_suppress(&clt->dev, false); kobject_uevent(&clt->dev.kobj, KOBJ_ADD); return clt; -err_dev: - device_unregister(&clt->dev); -err: +err_del: + device_del(&clt->dev); +err_put: free_percpu(clt->pcpu_path); - kfree(clt); + put_device(&clt->dev); return ERR_PTR(err); } @@ -2774,9 +2776,10 @@ static void free_clt(struct rtrs_clt_sess *clt) { free_permits(clt); free_percpu(clt->pcpu_path); - mutex_destroy(&clt->paths_ev_mutex); - mutex_destroy(&clt->paths_mutex); - /* release callback will free clt in last put */ + + /* + * release callback will free clt and destroy mutexes in last put + */ device_unregister(&clt->dev); }