drivers/amd/pm: fix a use-after-free in kv_parse_power_table

stable inclusion
from stable-v4.19.305
commit 8a27d9d9fc9b5564b8904c3a77a7dea482bfa34e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I94FUJ
CVE: CVE-2023-52469

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=8a27d9d9fc9b5564b8904c3a77a7dea482bfa34e



--------------------------------

[ Upstream commit 28dd788382c43b330480f57cd34cde0840896743 ]

When ps allocated by kzalloc equals to NULL, kv_parse_power_table
frees adev->pm.dpm.ps that allocated before. However, after the control
flow goes through the following call chains:

kv_parse_power_table
  |-> kv_dpm_init
        |-> kv_dpm_sw_init
	      |-> kv_dpm_fini

The adev->pm.dpm.ps is used in the for loop of kv_dpm_fini after its
first free in kv_parse_power_table and causes a use-after-free bug.

Fixes: a2e73f56 ("drm/amdgpu: Add support for CIK parts")
Signed-off-by: Zhipeng Lu <alexious@zju.edu.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Hui Tang <tanghui20@huawei.com>