linux-kernel - [PATCH 6.0 192/862] drm/amd/display: zeromem mypipe heap struct before using it

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Date:   Wed, 19 Oct 2022 10:24:39 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Wheeler <daniel.wheeler@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Qingqing Zhuo <qingqing.zhuo@....com>,
        Martin Leung <Martin.Leung@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 6.0 192/862] drm/amd/display: zeromem mypipe heap struct before using it

From: Martin Leung <Martin.Leung@....com>

commit 5ff32b52995155f91de582124485d0f0f8881363 upstream.

[Why & How]
bug was caused when moving variable from stack to
heap because it was reusable and garbage was left
over, so we need to zero mem

Fixes: 7acc487ab57e ("drm/amd/display: reduce stack size in dcn32 dml (v2)")
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@....com>
Signed-off-by: Martin Leung <Martin.Leung@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
+++ b/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
@@ -733,6 +733,8 @@ static void DISPCLKDPPCLKDCFCLKDeepSleep
 				mode_lib->vba.FCLKChangeLatency, v->UrgentLatency,
 				mode_lib->vba.SREnterPlusExitTime);
 
+			memset(&v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe, 0, sizeof(DmlPipe));
+
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.Dppclk = mode_lib->vba.DPPCLK[k];
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.Dispclk = mode_lib->vba.DISPCLK;
 			v->dummy_vars.DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerformanceCalculation.myPipe.PixelClock = mode_lib->vba.PixelClock[k];