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Message-ID: <20240925113641.1297102-157-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:26:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Alex Hung <alex.hung@....com>,
Rodrigo Siqueira <rodrigo.siqueira@....com>,
Tom Chung <chiahsuan.chung@....com>,
Daniel Wheeler <daniel.wheeler@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>,
harry.wentland@....com,
sunpeng.li@....com,
Rodrigo.Siqueira@....com,
christian.koenig@....com,
Xinhui.Pan@....com,
airlied@...il.com,
daniel@...ll.ch,
alvin.lee2@....com,
wayne.lin@....com,
wenjing.liu@....com,
sungjoon.kim@....com,
aurabindo.pillai@....com,
dillon.varone@....com,
amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.11 157/244] drm/amd/display: Check null pointers before using dc->clk_mgr
From: Alex Hung <alex.hung@....com>
[ Upstream commit 95d9e0803e51d5a24276b7643b244c7477daf463 ]
[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@....com>
Signed-off-by: Alex Hung <alex.hung@....com>
Signed-off-by: Tom Chung <chiahsuan.chung@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 9e7ba846e032b..81fab62ef38eb 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -5383,7 +5383,8 @@ void dc_allow_idle_optimizations_internal(struct dc *dc, bool allow, char const
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;
}
--
2.43.0
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