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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 6B6F8C55189 for ; Wed, 22 Apr 2020 10:08:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3B4D02076C for ; Wed, 22 Apr 2020 10:08:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550100; bh=TF/01RNQtNtjrq6KbrU+2FAcLCzjC1oerULda68YHj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=euekxNi63uVeBQXiLh/vw2ocxvd06HNErUhM8BtF6GxCr49Yjdhbt7yqbWp1abSvh q/Mpr7geXRkxmWd6CLhmxeaRcDYK9xMNngQ0MfHYH/97nOOwaKdVK1kWcufYjOqnmq QBNuNI2+FGRvb7bVNso9RQWFSdQl05hEI3ujPmI8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727991AbgDVKIT (ORCPT ); Wed, 22 Apr 2020 06:08:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:33400 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726596AbgDVKIO (ORCPT ); Wed, 22 Apr 2020 06:08:14 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 928F52077D; Wed, 22 Apr 2020 10:08:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587550094; bh=TF/01RNQtNtjrq6KbrU+2FAcLCzjC1oerULda68YHj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Hm8mr3vwcH0PrpiGEL4YyV1EKdp+HXbmRyMKj07WHPuNjKa+po7MI2nRLuKsjB+Hz doGZ3wtY8W6VLNeYh7DpRWub7r0a2mEnerwFJp8lf0g0xwE0G9/oXwXHVt2mL6j6Ty +ixGwUpcJUPspBWqoRUBVcHc5+sF+l1hHiyqL7QE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Misono Tomohiro , Trond Myklebust , Sasha Levin Subject: [PATCH 4.9 106/125] NFS: direct.c: Fix memory leak of dreq when nfs_get_lock_context fails Date: Wed, 22 Apr 2020 11:57:03 +0200 Message-Id: <20200422095049.996928532@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200422095032.909124119@linuxfoundation.org> References: <20200422095032.909124119@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Misono Tomohiro [ Upstream commit 8605cf0e852af3b2c771c18417499dc4ceed03d5 ] When dreq is allocated by nfs_direct_req_alloc(), dreq->kref is initialized to 2. Therefore we need to call nfs_direct_req_release() twice to release the allocated dreq. Usually it is called in nfs_file_direct_{read, write}() and nfs_direct_complete(). However, current code only calls nfs_direct_req_relese() once if nfs_get_lock_context() fails in nfs_file_direct_{read, write}(). So, that case would result in memory leak. Fix this by adding the missing call. Signed-off-by: Misono Tomohiro Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/direct.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 53f0012ace42f..de135d2591ffb 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -595,6 +595,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter) l_ctx = nfs_get_lock_context(dreq->ctx); if (IS_ERR(l_ctx)) { result = PTR_ERR(l_ctx); + nfs_direct_req_release(dreq); goto out_release; } dreq->l_ctx = l_ctx; @@ -1019,6 +1020,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter) l_ctx = nfs_get_lock_context(dreq->ctx); if (IS_ERR(l_ctx)) { result = PTR_ERR(l_ctx); + nfs_direct_req_release(dreq); goto out_release; } dreq->l_ctx = l_ctx; -- 2.20.1