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=-18.7 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,URIBL_RED, 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 89CE2C43333 for ; Mon, 28 Dec 2020 16:28:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 570DF208B6 for ; Mon, 28 Dec 2020 16:28:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437508AbgL1Q2Z (ORCPT ); Mon, 28 Dec 2020 11:28:25 -0500 Received: from mail.kernel.org ([198.145.29.99]:35072 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730788AbgL1NH2 (ORCPT ); Mon, 28 Dec 2020 08:07:28 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 302AA22583; Mon, 28 Dec 2020 13:06:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609160807; bh=WqeBf+0gRV4f9nEONl65QhiqwZ98zrNRUDdjurFhngc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LWteKYCGGvN5H7TnRRdkqIbl1jys8jH5Iyh7JWPqyYNrRpacjt/J0ZElNpxhWmXjA JasD4Aqmn/T9QK1jj3fktZXHQuS40o6ve9lCFYEVf8f+f1PCuPcNkgbOPPOmZZ5jh8 HA3188ldu4xWd60VK0Rr+5wgIchvDy2lc6c9FBoI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chunguang Xu , Theodore Tso , stable@kernel.org Subject: [PATCH 4.9 155/175] ext4: fix a memory leak of ext4_free_data Date: Mon, 28 Dec 2020 13:50:08 +0100 Message-Id: <20201228124900.762235727@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124853.216621466@linuxfoundation.org> References: <20201228124853.216621466@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chunguang Xu commit cca415537244f6102cbb09b5b90db6ae2c953bdd upstream. When freeing metadata, we will create an ext4_free_data and insert it into the pending free list. After the current transaction is committed, the object will be freed. ext4_mb_free_metadata() will check whether the area to be freed overlaps with the pending free list. If true, return directly. At this time, ext4_free_data is leaked. Fortunately, the probability of this problem is small, since it only occurs if the file system is corrupted such that a block is claimed by more one inode and those inodes are deleted within a single jbd2 transaction. Signed-off-by: Chunguang Xu Link: https://lore.kernel.org/r/1604764698-4269-8-git-send-email-brookxu@tencent.com Signed-off-by: Theodore Ts'o Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/mballoc.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -4650,6 +4650,7 @@ ext4_mb_free_metadata(handle_t *handle, ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, cluster), "Block already on to-be-freed list"); + kmem_cache_free(ext4_free_data_cachep, new_entry); return 0; } }