CVE-2022-49632: icmp: Fix a data-race around sysctl_icmp_errors_use_inbound_ifaddr.

CVE-2022-49632: icmp: Fix a data-race around sysctl_icmp_errors_use_inbound_ifaddr.

[Greg Kroah-Hartman]

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

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

icmp: Fix a data-race around sysctl_icmp_errors_use_inbound_ifaddr.

While reading sysctl_icmp_errors_use_inbound_ifaddr, it can be changed
concurrently.  Thus, we need to add READ_ONCE() to its reader.

The Linux kernel CVE team has assigned CVE-2022-49632 to this issue.


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

	Issue introduced in 2.6.12 with commit 1c2fb7f93cb20621772bf304f3dba0849942e5db and fixed in 5.15.56 with commit de9490c32bc10020efdd1509689a28f197d6dfb8
	Issue introduced in 2.6.12 with commit 1c2fb7f93cb20621772bf304f3dba0849942e5db and fixed in 5.18.13 with commit f9617844e4d5d6331dbce3fb19a24e5bda201e58
	Issue introduced in 2.6.12 with commit 1c2fb7f93cb20621772bf304f3dba0849942e5db and fixed in 5.19 with commit d2efabce81db7eed1c98fa1a3f203f0edd738ac3

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-2022-49632
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/ipv4/icmp.c
	net/ipv4/sysctl_net_ipv4.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/de9490c32bc10020efdd1509689a28f197d6dfb8
	https://git.kernel.org/stable/c/f9617844e4d5d6331dbce3fb19a24e5bda201e58
	https://git.kernel.org/stable/c/d2efabce81db7eed1c98fa1a3f203f0edd738ac3