Subject: CVE-2024-36945: net/smc: fix neighbour and rtable leak in smc_ib_find_route()

From: Greg Kroah-Hartman <[email-masked]>

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

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

net/smc: fix neighbour and rtable leak in smc_ib_find_route()

In smc_ib_find_route(), the neighbour found by neigh_lookup() and rtable
resolved by ip_route_output_flow() are not released or put before return.
It may cause the refcount leak, so fix it.

The Linux kernel CVE team has assigned CVE-2024-36945 to this issue.

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

	Issue introduced in 5.16 with commit e5c4744cfb59 and fixed in 6.1.91 with commit d5a466ab6e78
	Issue introduced in 5.16 with commit e5c4744cfb59 and fixed in 6.6.31 with commit 5df93c029a90
	Issue introduced in 5.16 with commit e5c4744cfb59 and fixed in 6.8.10 with commit da91e447d06d
	Issue introduced in 5.16 with commit e5c4744cfb59 and fixed in 6.9 with commit 2ddc0dd7fec8

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-2024-36945
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/smc/smc_ib.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/d5a466ab6e78d6f2e0f64435f1e17246c8e941ff
	https://git.kernel.org/stable/c/5df93c029a907b0ff5a4eeadd77ba06ff0a277d2
	https://git.kernel.org/stable/c/da91e447d06dc649fcf46e59122e7bf8f0b2e0db
	https://git.kernel.org/stable/c/2ddc0dd7fec86ee53b8928a5cca5fbddd4fc7c06