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

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@wanadoo.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


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

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@wanadoo.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


             reply	other threads:[~2023-04-25  7:53 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-25  7:53 Christophe JAILLET [this message]
2023-04-25  7:53 ` [PATCH] drm/amd/display: Correctly initialize some memory in get_available_dsc_slices() Christophe JAILLET
2023-04-26 17:28 ` Hamza Mahfooz
2023-04-26 17:28   ` Hamza Mahfooz

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