linux-cve-announce - CVE-2022-49959: openvswitch: fix memory leak at failed datapath creation

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Message-ID: <2025061813-CVE-2022-49959-d2b7@gregkh>
Date: Wed, 18 Jun 2025 13:00:24 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49959: openvswitch: fix memory leak at failed datapath creation

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

openvswitch: fix memory leak at failed datapath creation

ovs_dp_cmd_new()->ovs_dp_change()->ovs_dp_set_upcall_portids()
allocates array via kmalloc.
If for some reason new_vport() fails during ovs_dp_cmd_new()
dp->upcall_portids must be freed.
Add missing kfree.

Kmemleak example:
unreferenced object 0xffff88800c382500 (size 64):
  comm "dump_state", pid 323, jiffies 4294955418 (age 104.347s)
  hex dump (first 32 bytes):
    5e c2 79 e4 1f 7a 38 c7 09 21 38 0c 80 88 ff ff  ^.y..z8..!8.....
    03 00 00 00 0a 00 00 00 14 00 00 00 28 00 00 00  ............(...
  backtrace:
    [<0000000071bebc9f>] ovs_dp_set_upcall_portids+0x38/0xa0
    [<000000000187d8bd>] ovs_dp_change+0x63/0xe0
    [<000000002397e446>] ovs_dp_cmd_new+0x1f0/0x380
    [<00000000aa06f36e>] genl_family_rcv_msg_doit+0xea/0x150
    [<000000008f583bc4>] genl_rcv_msg+0xdc/0x1e0
    [<00000000fa10e377>] netlink_rcv_skb+0x50/0x100
    [<000000004959cece>] genl_rcv+0x24/0x40
    [<000000004699ac7f>] netlink_unicast+0x23e/0x360
    [<00000000c153573e>] netlink_sendmsg+0x24e/0x4b0
    [<000000006f4aa380>] sock_sendmsg+0x62/0x70
    [<00000000d0068654>] ____sys_sendmsg+0x230/0x270
    [<0000000012dacf7d>] ___sys_sendmsg+0x88/0xd0
    [<0000000011776020>] __sys_sendmsg+0x59/0xa0
    [<000000002e8f2dc1>] do_syscall_64+0x3b/0x90
    [<000000003243e7cb>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

The Linux kernel CVE team has assigned CVE-2022-49959 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 5.15 with commit b83d23a2a38b1770da0491257ae81d52307f7816 and fixed in 5.15.66 with commit ca54b2bfaab385778e55a9fd33f6c31e7f743b48
	Issue introduced in 5.15 with commit b83d23a2a38b1770da0491257ae81d52307f7816 and fixed in 5.19.8 with commit c0c1c0241917459644326a1a3102207c871ae159
	Issue introduced in 5.15 with commit b83d23a2a38b1770da0491257ae81d52307f7816 and fixed in 6.0 with commit a87406f4adee9c53b311d8a1ba2849c69e29a6d0

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-49959
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/openvswitch/datapath.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/ca54b2bfaab385778e55a9fd33f6c31e7f743b48
	https://git.kernel.org/stable/c/c0c1c0241917459644326a1a3102207c871ae159
	https://git.kernel.org/stable/c/a87406f4adee9c53b311d8a1ba2849c69e29a6d0