radeon: avoid double free in ci_dpm_init()

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[ Upstream commit 20c3dffdcc ]

Several calls to ci_dpm_fini() will attempt to free resources that
either have been freed before or haven't been allocated yet. This
may lead to undefined or dangerous behaviour.

For instance, if r600_parse_extended_power_table() fails, it might
call r600_free_extended_power_table() as will ci_dpm_fini() later
during error handling.

Fix this by only freeing pointers to objects previously allocated.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: cc8dbbb4f6 ("drm/radeon: add dpm support for CI dGPUs (v2)")
Co-developed-by: Natalia Petrova <n.petrova@fintech.ru>
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Nikita Zhandarovich 2023-04-13 08:12:28 -07:00 • committed by Greg Kroah-Hartman

parent 064e33b359

commit cb86b0e3d9

1 changed files with 20 additions and 8 deletions

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drivers/gpu/drm/radeon/ci_dpm.c

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