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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6342C4708D for ; Fri, 28 May 2021 11:30:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC518613D1 for ; Fri, 28 May 2021 11:30:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235045AbhE1LcT (ORCPT ); Fri, 28 May 2021 07:32:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49456 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234573AbhE1LcL (ORCPT ); Fri, 28 May 2021 07:32:11 -0400 Received: from mail-ed1-x52e.google.com (mail-ed1-x52e.google.com [IPv6:2a00:1450:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC3E9C06138B for ; Fri, 28 May 2021 04:30:35 -0700 (PDT) Received: by mail-ed1-x52e.google.com with SMTP id df21so4478111edb.3 for ; Fri, 28 May 2021 04:30:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ionos.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kyDSwVDxaz/2g5qVIzlNJqfchWdo5hv8O+V3TRK4MSo=; b=bOR/KGXCJg5e//wyv6Z0me4gDtvi36mKP6wdrHE+HLg6QfeqAyuinzyYUIgJ9h5f7n Cz87kaqQYvSgW0ccf6FD2OIETl4wDnBLGsIVwGmdAJz1UX+Hbe8QZEM6syh5Oxoc/XAs YBKskIroHOXC/Tbog8rFZ3N4BiQrd9wRGhE+E65YTfXsqFZlBJzLLnHwFTKvYMF427GU oU6XdXls6yyI/CWF2AmJ+dhO0gqDnDqhjSuvwumUILYyFk3FwE+EebqXVLVbYlDD4arU CNiGCOz9coFU22s9Cw/BEIkJ0fe/Pc+FxQmg4OQ2nZEhtqYKGBnWY8VlZ/3RzY/FsKCe WvUg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=kyDSwVDxaz/2g5qVIzlNJqfchWdo5hv8O+V3TRK4MSo=; b=L6s7Q5ZjAQ1NxQhPlAICr13z50PuP/CMpZUej6hHT2mjsVzQcckY45WebNFnR98lnU BgTuh5WB1v425sLq6KGQ7CqnZJbUbVrgdmg4FCrirE1dMgWadFKs86mF7Tfq7DYsK6ou J+lkiS1/AVsuSukJSMNIv6Jd32swL78TLzSxwreAClju01OeIeTTrKdRI8m8o2sL1buJ pmz2CJgjG6JAXNYoGNd9TobxakCozE36cwKflFt4tyxnJ4QFW+ofSYtKDNN8CAY0K/ae mTYYBMYwvD9FAaSmMyvv8YoxDWNSwWtEEYrWoWlqrpnc9ORdLGhJRQGf8jWBayw1ZH/b kC4w== X-Gm-Message-State: AOAM532J0njKNv5zU7aiELHWn6BtfiKlXKP4+gdz/BXVW+kbVFHn9VvN /etouKmTQgmptNn0gYTXCjhwnZuE27NTxQ== X-Google-Smtp-Source: ABdhPJzNQI5Lo3miaOBEIwUvmixjxYPiS6hiNiTYGHai1OHEBLxv6EJcTqRRb8JqltLodmjNcJTPOw== X-Received: by 2002:a05:6402:2691:: with SMTP id w17mr9644741edd.140.1622201434336; Fri, 28 May 2021 04:30:34 -0700 (PDT) Received: from jwang-Latitude-5491.fkb.profitbricks.net ([2001:16b8:497d:7d00:983b:122a:4685:3849]) by smtp.gmail.com with ESMTPSA id p15sm2594578edr.50.2021.05.28.04.30.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 May 2021 04:30:34 -0700 (PDT) From: Jack Wang To: linux-rdma@vger.kernel.org Cc: bvanassche@acm.org, leon@kernel.org, dledford@redhat.com, jgg@ziepe.ca, haris.iqbal@ionos.com, jinpu.wang@ionos.com, Gioh Kim , Gioh Kim Subject: [PATCHv3 for-next 17/20] RDMA/rtrs-srv: Fix memory leak of unfreed rtrs_srv_stats object Date: Fri, 28 May 2021 13:30:15 +0200 Message-Id: <20210528113018.52290-18-jinpu.wang@ionos.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210528113018.52290-1-jinpu.wang@ionos.com> References: <20210528113018.52290-1-jinpu.wang@ionos.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Gioh Kim When closing a session, currently the rtrs_srv_stats object in the closing session is freed by kobject release. But if it failed to create a session by various reasons, it must free the rtrs_srv_stats object directly because kobject is not created yet. This problem is found by kmemleak as below: 1. One client machine maps /dev/nullb0 with session name 'bla': root@test1:~# echo "sessname=bla path=ip:192.168.122.190 \ device_path=/dev/nullb0" > /sys/devices/virtual/rnbd-client/ctl/map_device 2. Another machine failed to create a session with the same name 'bla': root@test2:~# echo "sessname=bla path=ip:192.168.122.190 \ device_path=/dev/nullb1" > /sys/devices/virtual/rnbd-client/ctl/map_device -bash: echo: write error: Connection reset by peer 3. The kmemleak on server machine reported an error: unreferenced object 0xffff888033cdc800 (size 128): comm "kworker/2:1", pid 83, jiffies 4295086585 (age 2508.680s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000a72903b2>] __alloc_sess+0x1d4/0x1250 [rtrs_server] [<00000000d1e5321e>] rtrs_srv_rdma_cm_handler+0xc31/0xde0 [rtrs_server] [<00000000bb2f6e7e>] cma_ib_req_handler+0xdc5/0x2b50 [rdma_cm] [<00000000e896235d>] cm_process_work+0x2d/0x100 [ib_cm] [<00000000b6866c5f>] cm_req_handler+0x11bc/0x1c40 [ib_cm] [<000000005f5dd9aa>] cm_work_handler+0xe65/0x3cf2 [ib_cm] [<00000000610151e7>] process_one_work+0x4bc/0x980 [<00000000541e0f77>] worker_thread+0x78/0x5c0 [<00000000423898ca>] kthread+0x191/0x1e0 [<000000005a24b239>] ret_from_fork+0x3a/0x50 Fixes: 39c2d639ca183 ("RDMA/rtrs-srv: Set .release function for rtrs srv device during device init") Signed-off-by: Gioh Kim Signed-off-by: Md Haris Iqbal Signed-off-by: Jack Wang --- drivers/infiniband/ulp/rtrs/rtrs-srv.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c index 78a861843705..5639b29b8b02 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c @@ -1503,6 +1503,7 @@ static void free_sess(struct rtrs_srv_sess *sess) kobject_del(&sess->kobj); kobject_put(&sess->kobj); } else { + kfree(sess->stats); kfree(sess); } } -- 2.25.1