Subject: CVE-2021-47279: usb: misc: brcmstb-usb-pinmap: check return value after calling platform_get_resource()

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

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

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

usb: misc: brcmstb-usb-pinmap: check return value after calling platform_get_resource()

It will cause null-ptr-deref if platform_get_resource() returns NULL,
we need check the return value.

The Linux kernel CVE team has assigned CVE-2021-47279 to this issue.

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

	Issue introduced in 5.11 with commit 517c4c44b323 and fixed in 5.12.11 with commit 2147684be1eb
	Issue introduced in 5.11 with commit 517c4c44b323 and fixed in 5.13 with commit fbf649cd6d64

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-2021-47279
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:
	drivers/usb/misc/brcmstb-usb-pinmap.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/2147684be1ebdaf845783139b9bc4eba3fecd9e4
	https://git.kernel.org/stable/c/fbf649cd6d64d40c03c5397ecd6b1ae922ba7afc