CVE-2022-49356: SUNRPC: Trap RDMA segment overflows

CVE-2022-49356: SUNRPC: Trap RDMA segment overflows

[Greg Kroah-Hartman]

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

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

SUNRPC: Trap RDMA segment overflows

Prevent svc_rdma_build_writes() from walking off the end of a Write
chunk's segment array. Caught with KASAN.

The test that this fix replaces is invalid, and might have been left
over from an earlier prototype of the PCL work.

The Linux kernel CVE team has assigned CVE-2022-49356 to this issue.


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

	Issue introduced in 5.11 with commit 7a1cbfa18059a40d4752dab057384c3ca2de326c and fixed in 5.15.47 with commit ea26bf5eca1459b5a7824997d7823409ce38214e
	Issue introduced in 5.11 with commit 7a1cbfa18059a40d4752dab057384c3ca2de326c and fixed in 5.17.15 with commit 812c13521d4a72469c78ce06d8cdc8dc5b5557b5
	Issue introduced in 5.11 with commit 7a1cbfa18059a40d4752dab057384c3ca2de326c and fixed in 5.18.4 with commit 659f7568e09593945c221bf20217a82ebdfe1328
	Issue introduced in 5.11 with commit 7a1cbfa18059a40d4752dab057384c3ca2de326c and fixed in 5.19 with commit f012e95b377c73c0283f009823c633104dedb337

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-2022-49356
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/sunrpc/xprtrdma/svc_rdma_rw.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/ea26bf5eca1459b5a7824997d7823409ce38214e
	https://git.kernel.org/stable/c/812c13521d4a72469c78ce06d8cdc8dc5b5557b5
	https://git.kernel.org/stable/c/659f7568e09593945c221bf20217a82ebdfe1328
	https://git.kernel.org/stable/c/f012e95b377c73c0283f009823c633104dedb337