linux-kernel - [PATCH] drm/amd/display: Correctly initialize some memory in get_available_dsc

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Message-Id: <f7953bb41b7d5e28ec6bc3abfa06c8aaa0193ca4.1682409190.git.christophe.jaillet@wanadoo.fr>
Date:   Tue, 25 Apr 2023 09:53:34 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH] drm/amd/display: Correctly initialize some memory in get_available_dsc_slices()

The intent here is to clear the 'available_slices' buffer before setting
some values in it.

This is an array of int, so in order to fully initialize it, we must clear
MIN_AVAILABLE_SLICES_SIZE * sizeof(int) bytes.

Compute the right length of the buffer when calling memset().

Fixes: 97bda0322b8a ("drm/amd/display: Add DSC support for Navi (v2)")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
NOT even compile-tested.

make -j7  drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.o

on my setup, it fails with:
  CC      drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.o
drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c:27:10: fatal error: dc_hw_types.h: Aucun fichier ou dossier de ce type
   27 | #include "dc_hw_types.h"
      |          ^~~~~~~~~~~~~~~

I've not investigated why.
---
 drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
index b9a05bb025db..1d7384b2be28 100644
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -645,7 +645,7 @@ static int get_available_dsc_slices(union dsc_enc_slice_caps slice_caps, int *av
 {
 	int idx = 0;
 
-	memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE);
+	memset(available_slices, -1, MIN_AVAILABLE_SLICES_SIZE * sizeof(*available_slices));
 
 	if (slice_caps.bits.NUM_SLICES_1)
 		available_slices[idx++] = 1;
-- 
2.34.1