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drm/amd/display: Check null pointers before using dc->clk_mgr

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[ Upstream commit 95d9e0803e ]

[WHY & HOW]
dc->clk_mgr is null checked previously in the same function, indicating
it might be null.

Passing "dc" to "dc->hwss.apply_idle_power_optimizations", which
dereferences null "dc->clk_mgr". (The function pointer resolves to
"dcn35_apply_idle_power_optimizations".)

This fixes 1 FORWARD_NULL issue reported by Coverity.

Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alex Hung 2024-07-29 15:29:09 -06:00 committed by Greg Kroah-Hartman
parent 4778982c73
commit 9641bc4adf
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/core/dc.c
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@ -4716,7 +4716,8 @@ void dc_allow_idle_optimizations(struct dc *dc, bool allow)
if (allow == dc->idle_optimizations_allowed)
return;
if (dc->hwss.apply_idle_power_optimizations && dc->hwss.apply_idle_power_optimizations(dc, allow))
if (dc->hwss.apply_idle_power_optimizations && dc->clk_mgr != NULL &&
dc->hwss.apply_idle_power_optimizations(dc, allow))
dc->idle_optimizations_allowed = allow;
}