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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,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 A7A41C28CC0 for ; Thu, 30 May 2019 04:06:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8121825071 for ; Thu, 30 May 2019 04:06:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559189195; bh=NVvAzGOIg97qKyAva+g4y1yXfLiTQHg1ERmm+Zug250=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FFenheiFVT3lWul5s6XBw9pDAnTzNQnRUKB3Wq6DVfwxje/+janvXqrgNqAV0rFFx IsRytw8hjSANWD1bSRIrFHgZ3K0Ni2Pz1ZhJQfbJlMRlLe1BVWTQE9oc/DaCIXS+az OpcHIqOThzHyQmQPNxM7t7nLJAxijUNreICDB/3U= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727012AbfE3EG3 (ORCPT ); Thu, 30 May 2019 00:06:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:47768 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731169AbfE3DRf (ORCPT ); Wed, 29 May 2019 23:17:35 -0400 Received: from localhost (ip67-88-213-2.z213-88-67.customer.algx.net [67.88.213.2]) (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 9544A246BB; Thu, 30 May 2019 03:17:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186254; bh=NVvAzGOIg97qKyAva+g4y1yXfLiTQHg1ERmm+Zug250=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ATaeByppsrPo4o3JKwpRYydMSOClOnM2SCg8109Ra+r/DtrHetn7aupF3C95JRVSi ZzD8tc51zpSahUSc784MsYF0Y2mTd8BAfl+iDB3MCK+7Vlxh1LmKFw7A1prqkAiKzy MnKZkXoNmiihuumWQH3bqe8rw/0fJhvB2wxjT1VQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wenwen Wang , Richard Guy Briggs , Paul Moore , Sasha Levin Subject: [PATCH 4.19 125/276] audit: fix a memory leak bug Date: Wed, 29 May 2019 20:04:43 -0700 Message-Id: <20190530030533.643045833@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030523.133519668@linuxfoundation.org> References: <20190530030523.133519668@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org [ Upstream commit 70c4cf17e445264453bc5323db3e50aa0ac9e81f ] In audit_rule_change(), audit_data_to_entry() is firstly invoked to translate the payload data to the kernel's rule representation. In audit_data_to_entry(), depending on the audit field type, an audit tree may be created in audit_make_tree(), which eventually invokes kmalloc() to allocate the tree. Since this tree is a temporary tree, it will be then freed in the following execution, e.g., audit_add_rule() if the message type is AUDIT_ADD_RULE or audit_del_rule() if the message type is AUDIT_DEL_RULE. However, if the message type is neither AUDIT_ADD_RULE nor AUDIT_DEL_RULE, i.e., the default case of the switch statement, this temporary tree is not freed. To fix this issue, only allocate the tree when the type is AUDIT_ADD_RULE or AUDIT_DEL_RULE. Signed-off-by: Wenwen Wang Reviewed-by: Richard Guy Briggs Signed-off-by: Paul Moore Signed-off-by: Sasha Levin --- kernel/auditfilter.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index bf309f2592c46..425c67e4f5681 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1114,22 +1114,24 @@ int audit_rule_change(int type, int seq, void *data, size_t datasz) int err = 0; struct audit_entry *entry; - entry = audit_data_to_entry(data, datasz); - if (IS_ERR(entry)) - return PTR_ERR(entry); - switch (type) { case AUDIT_ADD_RULE: + entry = audit_data_to_entry(data, datasz); + if (IS_ERR(entry)) + return PTR_ERR(entry); err = audit_add_rule(entry); audit_log_rule_change("add_rule", &entry->rule, !err); break; case AUDIT_DEL_RULE: + entry = audit_data_to_entry(data, datasz); + if (IS_ERR(entry)) + return PTR_ERR(entry); err = audit_del_rule(entry); audit_log_rule_change("remove_rule", &entry->rule, !err); break; default: - err = -EINVAL; WARN_ON(1); + return -EINVAL; } if (err || type == AUDIT_DEL_RULE) { -- 2.20.1