From: Liu Shixin <liushixin2@huawei.com>
To: Paul Moore <paul@paul-moore.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: <netdev@vger.kernel.org>, <linux-security-module@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Liu Shixin <liushixin2@huawei.com>
Subject: [PATCH -next] netlabel: Fix memory leak in netlbl_mgmt_add_common
Date: Thu, 10 Jun 2021 10:01:08 +0800 [thread overview]
Message-ID: <20210610020108.1356361-1-liushixin2@huawei.com> (raw)
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@huawei.com>
Signed-off-by: Liu Shixin <liushixin2@huawei.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
next reply other threads:[~2021-06-10 1:29 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 2:01 Liu Shixin [this message]
2021-06-10 3:08 ` [PATCH -next] netlabel: Fix memory leak in netlbl_mgmt_add_common Dongliang Mu
2021-06-10 10:45 ` Liu Shixin
2021-06-10 12:15 ` Dongliang Mu
2021-06-10 23:38 ` Paul Moore
2021-06-11 4:05 ` Dongliang Mu
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