Subject: CVE-2022-48749: drm/msm/dpu: invalid parameter check in dpu_setup_dspp_pcc

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

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

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

drm/msm/dpu: invalid parameter check in dpu_setup_dspp_pcc

The function performs a check on the "ctx" input parameter, however, it
is used before the check.

Initialize the "base" variable after the sanity check to avoid a
possible NULL pointer dereference.

Addresses-Coverity-ID: 1493866 ("Null pointer dereference")

The Linux kernel CVE team has assigned CVE-2022-48749 to this issue.

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

	Issue introduced in 5.8 with commit 4259ff7ae509 and fixed in 5.10.96 with commit 93a6e920d8cc
	Issue introduced in 5.8 with commit 4259ff7ae509 and fixed in 5.15.19 with commit 8f069f6dde51
	Issue introduced in 5.8 with commit 4259ff7ae509 and fixed in 5.16.5 with commit 1ebc18836d5d
	Issue introduced in 5.8 with commit 4259ff7ae509 and fixed in 5.17 with commit 170b22234d54

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-2022-48749
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/gpu/drm/msm/disp/dpu1/dpu_hw_dspp.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/93a6e920d8ccb4df846c03b6e72f7e08843d294c
	https://git.kernel.org/stable/c/8f069f6dde518dfebe86e848508c07e497bd9298
	https://git.kernel.org/stable/c/1ebc18836d5df09061657f8c548e594cbb519476
	https://git.kernel.org/stable/c/170b22234d5495f5e0844246e23f004639ee89ba