CVE-2022-49593: tcp: Fix a data-race around sysctl_tcp_probe_interval.

CVE-2022-49593: tcp: Fix a data-race around sysctl_tcp_probe_interval.

[Greg Kroah-Hartman]

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

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

tcp: Fix a data-race around sysctl_tcp_probe_interval.

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

The Linux kernel CVE team has assigned CVE-2022-49593 to this issue.


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

	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 4.14.290 with commit 80dabd089086e6553b7acfcff2ec223bdada87a1
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 4.19.254 with commit b3798d3519eda9c409bb0815b0102f27ec42468d
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 5.4.208 with commit 73a11588751a2c13f25d9da8117efc9a79b1843f
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 5.10.134 with commit c61aede097d350d890fa1edc9521b0072e14a0b8
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 5.15.58 with commit e6b6f027e2854a51f345a5e3e808d7a88001d4f8
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 5.18.15 with commit b14cc8afbbcbc6dce4797913c0b85266b897f541
	Issue introduced in 4.1 with commit 05cbc0db03e82128f2e7e353d4194dd24a1627fe and fixed in 5.19 with commit 2a85388f1d94a9f8b5a529118a2c5eaa0520d85c

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-2022-49593
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/tcp_output.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/80dabd089086e6553b7acfcff2ec223bdada87a1
	https://git.kernel.org/stable/c/b3798d3519eda9c409bb0815b0102f27ec42468d
	https://git.kernel.org/stable/c/73a11588751a2c13f25d9da8117efc9a79b1843f
	https://git.kernel.org/stable/c/c61aede097d350d890fa1edc9521b0072e14a0b8
	https://git.kernel.org/stable/c/e6b6f027e2854a51f345a5e3e808d7a88001d4f8
	https://git.kernel.org/stable/c/b14cc8afbbcbc6dce4797913c0b85266b897f541
	https://git.kernel.org/stable/c/2a85388f1d94a9f8b5a529118a2c5eaa0520d85c