linux-cve-announce - CVE-2022-50500: netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources

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Message-ID: <2025100420-CVE-2022-50500-787b@gregkh>
Date: Sat,  4 Oct 2025 17:51:25 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50500: netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources_register() failed

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

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

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

netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources_register() failed

If some items in nsim_dev_resources_register() fail, memory leak will
occur. The following is the memory leak information.

unreferenced object 0xffff888074c02600 (size 128):
  comm "echo", pid 8159, jiffies 4294945184 (age 493.530s)
  hex dump (first 32 bytes):
    40 47 ea 89 ff ff ff ff 01 00 00 00 00 00 00 00  @G..............
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
  backtrace:
    [<0000000011a31c98>] kmalloc_trace+0x22/0x60
    [<0000000027384c69>] devl_resource_register+0x144/0x4e0
    [<00000000a16db248>] nsim_drv_probe+0x37a/0x1260
    [<000000007d1f448c>] really_probe+0x20b/0xb10
    [<00000000c416848a>] __driver_probe_device+0x1b3/0x4a0
    [<00000000077e0351>] driver_probe_device+0x49/0x140
    [<0000000054f2465a>] __device_attach_driver+0x18c/0x2a0
    [<000000008538f359>] bus_for_each_drv+0x151/0x1d0
    [<0000000038e09747>] __device_attach+0x1c9/0x4e0
    [<00000000dd86e533>] bus_probe_device+0x1d5/0x280
    [<00000000839bea35>] device_add+0xae0/0x1cb0
    [<000000009c2abf46>] new_device_store+0x3b6/0x5f0
    [<00000000fb823d7f>] bus_attr_store+0x72/0xa0
    [<000000007acc4295>] sysfs_kf_write+0x106/0x160
    [<000000005f50cb4d>] kernfs_fop_write_iter+0x3a8/0x5a0
    [<0000000075eb41bf>] vfs_write+0x8f0/0xc80

The Linux kernel CVE team has assigned CVE-2022-50500 to this issue.


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

	Issue introduced in 4.17 with commit 37923ed6b8cea94d7d76038e2f72c57a0b45daab and fixed in 6.0.7 with commit 7c4957fe40e2a628b7cceaf4c9bfb5b701774d05
	Issue introduced in 4.17 with commit 37923ed6b8cea94d7d76038e2f72c57a0b45daab and fixed in 6.1 with commit 6b1da9f7126f05e857da6db24c6a04aa7974d644

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-2022-50500
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:
	drivers/net/netdevsim/dev.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/7c4957fe40e2a628b7cceaf4c9bfb5b701774d05
	https://git.kernel.org/stable/c/6b1da9f7126f05e857da6db24c6a04aa7974d644