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 6581FC28CC2 for ; Thu, 30 May 2019 03:44:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3DB6B24C82 for ; Thu, 30 May 2019 03:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559187898; bh=uhWnmlcoF64u9MNy02zFBaoTIoSFXPkx4megjZ25jHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XOyliS7/OZWOGVBbSiV1gRn6KfoK5NqjYUTE8G7CGtAq7xKgN7OkZcClat06kmO9E oxayDmQeSEdYqGpRiC09QjmxgHRKKoXQxMLwdxt8bk+PZSIxUz6WIMhHltvx+cXIMo 5oTjTanolMM0jhzUIuWCpnqVMdtxwwE1usiGbMM0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732368AbfE3DUw (ORCPT ); Wed, 29 May 2019 23:20:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:60252 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729807AbfE3DUv (ORCPT ); Wed, 29 May 2019 23:20:51 -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 085662497E; Thu, 30 May 2019 03:20:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559186451; bh=uhWnmlcoF64u9MNy02zFBaoTIoSFXPkx4megjZ25jHc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kh1WaY8zfph02blH5dlBkPc7aZn2WPu4ORw/CyfT2z98dHShUgv2iJUFcC+kCwq9D r77j/Gfpz3lSCCiH3+PdANw6S8lI+M3gEpHALl8prnBgEul//8jXdIlImhAdHeGQlT fbZacUVrAae8SK2YOA25z89WsYyreLjoTvT6hTtA= 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 4.9 061/128] audit: fix a memory leak bug Date: Wed, 29 May 2019 20:06:33 -0700 Message-Id: <20190530030445.709897200@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190530030432.977908967@linuxfoundation.org> References: <20190530030432.977908967@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 cd4f41397c7e8..42b7251c597fb 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1095,22 +1095,24 @@ int audit_rule_change(int type, __u32 portid, int seq, void *data, 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