From patchwork Tue Jun 15 02:14:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Liu Shixin X-Patchwork-Id: 460956 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 D824DC48BE6 for ; Tue, 15 Jun 2021 02:26:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3DBE613D3 for ; Tue, 15 Jun 2021 02:26:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230452AbhFOC2x (ORCPT ); Mon, 14 Jun 2021 22:28:53 -0400 Received: from szxga03-in.huawei.com ([45.249.212.189]:6364 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230181AbhFOC2w (ORCPT ); Mon, 14 Jun 2021 22:28:52 -0400 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.55]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4G3rZS16pFz62Gt; Tue, 15 Jun 2021 09:38:56 +0800 (CST) Received: from dggpemm500009.china.huawei.com (7.185.36.225) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 15 Jun 2021 09:42:53 +0800 Received: from huawei.com (10.175.113.32) by dggpemm500009.china.huawei.com (7.185.36.225) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Tue, 15 Jun 2021 09:42:53 +0800 From: Liu Shixin To: Paul Moore , Dongliang Mu , "David S. Miller" , "Jakub Kicinski" CC: , , , Liu Shixin Subject: [PATCH -next v3] netlabel: Fix memory leak in netlbl_mgmt_add_common Date: Tue, 15 Jun 2021 10:14:44 +0800 Message-ID: <20210615021444.2306687-1-liushixin2@huawei.com> X-Mailer: git-send-email 2.18.0.huawei.25 MIME-Version: 1.0 X-Originating-IP: [10.175.113.32] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpemm500009.china.huawei.com (7.185.36.225) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hulk Robot reported memory leak in netlbl_mgmt_add_common. The problem is non-freed map in case of netlbl_domhsh_add() failed. BUG: memory leak unreferenced object 0xffff888100ab7080 (size 96): comm "syz-executor537", pid 360, jiffies 4294862456 (age 22.678s) hex dump (first 32 bytes): 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ fe 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 ................ backtrace: [<0000000008b40026>] netlbl_mgmt_add_common.isra.0+0xb2a/0x1b40 [<000000003be10950>] netlbl_mgmt_add+0x271/0x3c0 [<00000000c70487ed>] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 [<000000001f2ff614>] genl_rcv_msg+0x2bf/0x4f0 [<0000000089045792>] netlink_rcv_skb+0x134/0x3d0 [<0000000020e96fdd>] genl_rcv+0x24/0x40 [<0000000042810c66>] netlink_unicast+0x4a0/0x6a0 [<000000002e1659f0>] netlink_sendmsg+0x789/0xc70 [<000000006e43415f>] sock_sendmsg+0x139/0x170 [<00000000680a73d7>] ____sys_sendmsg+0x658/0x7d0 [<0000000065cbb8af>] ___sys_sendmsg+0xf8/0x170 [<0000000019932b6c>] __sys_sendmsg+0xd3/0x190 [<00000000643ac172>] do_syscall_64+0x37/0x90 [<000000009b79d6dc>] entry_SYSCALL_64_after_hwframe+0x44/0xae Fixes: 63c416887437 ("netlabel: Add network address selectors to the NetLabel/LSM domain mapping") Reported-by: Hulk Robot Signed-off-by: Liu Shixin --- v1->v2: According to Dongliang's and Paul's advices, simplify the code. v2->v3: Fix the style error. net/netlabel/netlabel_mgmt.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c index e664ab990941..032b7d7b32c7 100644 --- a/net/netlabel/netlabel_mgmt.c +++ b/net/netlabel/netlabel_mgmt.c @@ -76,6 +76,7 @@ static const struct nla_policy netlbl_mgmt_genl_policy[NLBL_MGMT_A_MAX + 1] = { static int netlbl_mgmt_add_common(struct genl_info *info, struct netlbl_audit *audit_info) { + void *pmap = NULL; int ret_val = -EINVAL; struct netlbl_domaddr_map *addrmap = NULL; struct cipso_v4_doi *cipsov4 = NULL; @@ -175,6 +176,7 @@ static int netlbl_mgmt_add_common(struct genl_info *info, ret_val = -ENOMEM; goto add_free_addrmap; } + pmap = map; map->list.addr = addr->s_addr & mask->s_addr; map->list.mask = mask->s_addr; map->list.valid = 1; @@ -183,10 +185,8 @@ static int netlbl_mgmt_add_common(struct genl_info *info, map->def.cipso = cipsov4; ret_val = netlbl_af4list_add(&map->list, &addrmap->list4); - if (ret_val != 0) { - kfree(map); - goto add_free_addrmap; - } + if (ret_val != 0) + goto add_free_map; entry->family = AF_INET; entry->def.type = NETLBL_NLTYPE_ADDRSELECT; @@ -223,6 +223,7 @@ static int netlbl_mgmt_add_common(struct genl_info *info, ret_val = -ENOMEM; goto add_free_addrmap; } + pmap = map; map->list.addr = *addr; map->list.addr.s6_addr32[0] &= mask->s6_addr32[0]; map->list.addr.s6_addr32[1] &= mask->s6_addr32[1]; @@ -235,10 +236,8 @@ static int netlbl_mgmt_add_common(struct genl_info *info, map->def.calipso = calipso; ret_val = netlbl_af6list_add(&map->list, &addrmap->list6); - if (ret_val != 0) { - kfree(map); - goto add_free_addrmap; - } + if (ret_val != 0) + goto add_free_map; entry->family = AF_INET6; entry->def.type = NETLBL_NLTYPE_ADDRSELECT; @@ -248,10 +247,12 @@ static int netlbl_mgmt_add_common(struct genl_info *info, ret_val = netlbl_domhsh_add(entry, audit_info); if (ret_val != 0) - goto add_free_addrmap; + goto add_free_map; return 0; +add_free_map: + kfree(pmap); add_free_addrmap: kfree(addrmap); add_doi_put_def: