linux-kernel - [PATCH -next] netlabel: Fix memory leak in netlbl_mgmt_add

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Message-ID: <20210610020108.1356361-1-liushixin2@huawei.com>
Date:   Thu, 10 Jun 2021 10:01:08 +0800
From:   Liu Shixin <liushixin2@...wei.com>
To:     Paul Moore <paul@...l-moore.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH -next] netlabel: Fix memory leak in netlbl_mgmt_add_common

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 <hulkci@...wei.com>
Signed-off-by: Liu Shixin <liushixin2@...wei.com>
---
 net/netlabel/netlabel_mgmt.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/net/netlabel/netlabel_mgmt.c b/net/netlabel/netlabel_mgmt.c
index e664ab990941..e7f00c0f441e 100644
--- a/net/netlabel/netlabel_mgmt.c
+++ b/net/netlabel/netlabel_mgmt.c
@@ -191,6 +191,12 @@ static int netlbl_mgmt_add_common(struct genl_info *info,
 		entry->family = AF_INET;
 		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 		entry->def.addrsel = addrmap;
+
+		ret_val = netlbl_domhsh_add(entry, audit_info);
+		if (ret_val != 0) {
+			kfree(map);
+			goto add_free_addrmap;
+		}
 #if IS_ENABLED(CONFIG_IPV6)
 	} else if (info->attrs[NLBL_MGMT_A_IPV6ADDR]) {
 		struct in6_addr *addr;
@@ -243,13 +249,19 @@ static int netlbl_mgmt_add_common(struct genl_info *info,
 		entry->family = AF_INET6;
 		entry->def.type = NETLBL_NLTYPE_ADDRSELECT;
 		entry->def.addrsel = addrmap;
+
+		ret_val = netlbl_domhsh_add(entry, audit_info);
+		if (ret_val != 0) {
+			kfree(map);
+			goto add_free_addrmap;
+		}
 #endif /* IPv6 */
+	} else {
+		ret_val = netlbl_domhsh_add(entry, audit_info);
+		if (ret_val != 0)
+			goto add_free_addrmap;
 	}
 
-	ret_val = netlbl_domhsh_add(entry, audit_info);
-	if (ret_val != 0)
-		goto add_free_addrmap;
-
 	return 0;
 
 add_free_addrmap:
-- 
2.18.0.huawei.25