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=-9.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 A9024C282E1 for ; Wed, 24 Apr 2019 14:53:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7788021902 for ; Wed, 24 Apr 2019 14:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556117582; bh=HUdHo3J9BCDfV6o4EOB0r6oGZt3+aBvAAtgAudEswSc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Af2fe6jZFD0qTtDQ1EammtYIAWR6AheRGmkRP1bNiQVeewgtFMY4WZoGttfoKgoRx tBZ9KQZDaAkTnmoT03r0bUa7yxbMo3USMNzG2pktvYaKqIdYhSmMGEfsyt8Nu4DfLG 6U81kg4iN9lIC4xR6kiOgugwQxD28Y/s+1+WzmiM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733007AbfDXOxB (ORCPT ); Wed, 24 Apr 2019 10:53:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:52024 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732965AbfDXOwa (ORCPT ); Wed, 24 Apr 2019 10:52:30 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 699C2218FE; Wed, 24 Apr 2019 14:52:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556117549; bh=HUdHo3J9BCDfV6o4EOB0r6oGZt3+aBvAAtgAudEswSc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=p7SbhMCYh7+PDCUolyL3jDoLvEuvzDgRB2iZqa7fUMQoSr5v9mfB3mervjvEDhv5D 31e1kVQTSQ15fCGcNUNLVBibhikaGzIU+eyOplqd5EfyQDx1TCV6Q8iB/jFz4wArnY NaYHlrzM82oKjO6UMqTETcgx6XVsOfEHb0oxOftE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mike Kravetz , Andrew Morton , Linus Torvalds , Sasha Levin , linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.4 12/15] hugetlbfs: fix memory leak for resv_map Date: Wed, 24 Apr 2019 10:51:49 -0400 Message-Id: <20190424145152.31351-12-sashal@kernel.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20190424145152.31351-1-sashal@kernel.org> References: <20190424145152.31351-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Kravetz [ Upstream commit 58b6e5e8f1addd44583d61b0a03c0f5519527e35 ] When mknod is used to create a block special file in hugetlbfs, it will allocate an inode and kmalloc a 'struct resv_map' via resv_map_alloc(). inode->i_mapping->private_data will point the newly allocated resv_map. However, when the device special file is opened bd_acquire() will set inode->i_mapping to bd_inode->i_mapping. Thus the pointer to the allocated resv_map is lost and the structure is leaked. Programs to reproduce: mount -t hugetlbfs nodev hugetlbfs mknod hugetlbfs/dev b 0 0 exec 30<> hugetlbfs/dev umount hugetlbfs/ resv_map structures are only needed for inodes which can have associated page allocations. To fix the leak, only allocate resv_map for those inodes which could possibly be associated with page allocations. Link: http://lkml.kernel.org/r/20190401213101.16476-1-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz Reviewed-by: Andrew Morton Reported-by: Yufen Yu Suggested-by: Yufen Yu Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/hugetlbfs/inode.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index cefae2350da5..27c4e2ac39a9 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -745,11 +745,17 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, umode_t mode, dev_t dev) { struct inode *inode; - struct resv_map *resv_map; + struct resv_map *resv_map = NULL; - resv_map = resv_map_alloc(); - if (!resv_map) - return NULL; + /* + * Reserve maps are only needed for inodes that can have associated + * page allocations. + */ + if (S_ISREG(mode) || S_ISLNK(mode)) { + resv_map = resv_map_alloc(); + if (!resv_map) + return NULL; + } inode = new_inode(sb); if (inode) { @@ -790,8 +796,10 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb, break; } lockdep_annotate_inode_mutex_key(inode); - } else - kref_put(&resv_map->refs, resv_map_release); + } else { + if (resv_map) + kref_put(&resv_map->refs, resv_map_release); + } return inode; } -- 2.19.1