1. 漏洞描述

In the Linux kernel, the following vulnerability has been resolved:

net: ipv4: fix memory leak in netlbl_cipsov4_add_std

Reported by syzkaller:
BUG: memory leak
unreferenced object 0xffff888105df7000 (size 64):
comm "syz-executor842", pid 360, jiffies 4294824824 (age 22.546s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000e67ed558&gt;] kmalloc include/linux/slab.h:590 [inline]
[<00000000e67ed558&gt;] kzalloc include/linux/slab.h:720 [inline]
[<00000000e67ed558&gt;] netlbl_cipsov4_add_std net/netlabel/netlabel_cipso_v4.c:145 [inline]
[<00000000e67ed558&gt;] netlbl_cipsov4_add+0x390/0x2340 net/netlabel/netlabel_cipso_v4.c:416
[<0000000006040154&gt;] genl_family_rcv_msg_doit.isra.0+0x20e/0x320 net/netlink/genetlink.c:739
[<00000000204d7a1c&gt;] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
[<00000000204d7a1c&gt;] genl_rcv_msg+0x2bf/0x4f0 net/netlink/genetlink.c:800
[<00000000c0d6a995&gt;] netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2504
[<00000000d78b9d2c&gt;] genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
[<000000009733081b&gt;] netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
[<000000009733081b&gt;] netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1340
[<00000000d5fd43b8&gt;] netlink_sendmsg+0x789/0xc70 net/netlink/af_netlink.c:1929
[<000000000a2d1e40&gt;] sock_sendmsg_nosec net/socket.c:654 [inline]
[<000000000a2d1e40&gt;] sock_sendmsg+0x139/0x170 net/socket.c:674
[<00000000321d1969&gt;] ____sys_sendmsg+0x658/0x7d0 net/socket.c:2350
[<00000000964e16bc&gt;] ___sys_sendmsg+0xf8/0x170 net/socket.c:2404
[<000000001615e288&gt;] __sys_sendmsg+0xd3/0x190 net/socket.c:2433
[<000000004ee8b6a5&gt;] do_syscall_64+0x37/0x90 arch/x86/entry/common.c:47
[<00000000171c7cee&gt;] entry_SYSCALL_64_after_hwframe+0x44/0xae

The memory of doi_def-&gt;map.std pointing is allocated in
netlbl_cipsov4_add_std, but no place has freed it. It should be
freed in cipso_v4_doi_free which frees the cipso DOI resource.

2. 影响范围

3. 影响组件

4. 修复版本

5. 修复方法

6. 下载链接