CVE-2022-48768: tracing/histogram: Fix a potential memory leak for kstrdup()

CVE-2022-48768: tracing/histogram: Fix a potential memory leak for kstrdup()

[Greg Kroah-Hartman]

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

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

tracing/histogram: Fix a potential memory leak for kstrdup()

kfree() is missing on an error path to free the memory allocated by
kstrdup():

  p = param = kstrdup(data->params[i], GFP_KERNEL);

So it is better to free it via kfree(p).

The Linux kernel CVE team has assigned CVE-2022-48768 to this issue.


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

	Issue introduced in 5.4.19 with commit 38b67e60b6b5 and fixed in 5.4.176 with commit 8a8878ebb596
	Issue introduced in 5.6 with commit d380dcde9a07 and fixed in 5.10.96 with commit d71b06aa9950
	Issue introduced in 5.6 with commit d380dcde9a07 and fixed in 5.15.19 with commit e33fa4a46ee2
	Issue introduced in 5.6 with commit d380dcde9a07 and fixed in 5.16.5 with commit df86e2fe808c
	Issue introduced in 5.6 with commit d380dcde9a07 and fixed in 5.17 with commit e629e7b525a1
	Issue introduced in 5.5.6 with commit c78a2baf5e1f

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-2022-48768
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:
	kernel/trace/trace_events_hist.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/8a8878ebb596281f50fc0b9a6e1f23f0d7f154e8
	https://git.kernel.org/stable/c/d71b06aa995007eafd247626d0669b9364c42ad7
	https://git.kernel.org/stable/c/e33fa4a46ee22de88a700e2e3d033da8214a5175
	https://git.kernel.org/stable/c/df86e2fe808c3536a9dba353cc2bebdfea00d0cf
	https://git.kernel.org/stable/c/e629e7b525a179e29d53463d992bdee759c950fb