linux-kernel - [PATCH v3] ASoC: Intel: Skylake: skl-topology: fix -frame-larger-than

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Date:   Sun, 14 Mar 2021 18:39:08 -0700
From:   Nick Desaulniers <nick.desaulniers@...il.com>
To:     nick.desaulniers@...il.com
Cc:     Julia.Lawall@...ia.fr, alsa-devel@...a-project.org,
        amadeuszx.slawinski@...ux.intel.com,
        andriy.shevchenko@...ux.intel.com, broonie@...nel.org,
        cezary.rojewski@...el.com, guennadi.liakhovetski@...ux.intel.com,
        liam.r.girdwood@...ux.intel.com, linux-kernel@...r.kernel.org,
        mateusz.gorski@...ux.intel.com, perex@...ex.cz,
        pierre-louis.bossart@...ux.intel.com, tiwai@...e.com,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        yang.jie@...ux.intel.com
Subject: [PATCH v3] ASoC: Intel: Skylake: skl-topology: fix -frame-larger-than

Fixes:
sound/soc/intel/skylake/skl-topology.c:3613:13: warning: stack frame
size of 1304 bytes in function 'skl_tplg_complete'
[-Wframe-larger-than=]

struct snd_ctl_elem_value is 1224 bytes in my configuration.

Heap allocate it, then free it within the current frame.

Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
---
Changes V2 -> V3:
* change to kmalloc+memset to fix logic error, as per Andy.
Changes V1 -> V2:
* rebased on mainline.

 sound/soc/intel/skylake/skl-topology.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
index b824086203b9..c0fdab39e7c2 100644
--- a/sound/soc/intel/skylake/skl-topology.c
+++ b/sound/soc/intel/skylake/skl-topology.c
@@ -3613,10 +3613,15 @@ static int skl_manifest_load(struct snd_soc_component *cmpnt, int index,
 static void skl_tplg_complete(struct snd_soc_component *component)
 {
 	struct snd_soc_dobj *dobj;
-	struct snd_soc_acpi_mach *mach =
-		dev_get_platdata(component->card->dev);
+	struct snd_soc_acpi_mach *mach;
+	struct snd_ctl_elem_value *val;
 	int i;
 
+	val = kmalloc(sizeof(*val), GFP_KERNEL);
+	if (!val)
+		return;
+
+	mach = dev_get_platdata(component->card->dev);
 	list_for_each_entry(dobj, &component->dobj_list, list) {
 		struct snd_kcontrol *kcontrol = dobj->control.kcontrol;
 		struct soc_enum *se;
@@ -3632,14 +3637,14 @@ static void skl_tplg_complete(struct snd_soc_component *component)
 		sprintf(chan_text, "c%d", mach->mach_params.dmic_num);
 
 		for (i = 0; i < se->items; i++) {
-			struct snd_ctl_elem_value val = {};
-
 			if (strstr(texts[i], chan_text)) {
-				val.value.enumerated.item[0] = i;
-				kcontrol->put(kcontrol, &val);
+				memset(val, 0, sizeof(*val));
+				val->value.enumerated.item[0] = i;
+				kcontrol->put(kcontrol, val);
 			}
 		}
 	}
+	kfree(val);
 }
 
 static struct snd_soc_tplg_ops skl_tplg_ops  = {

base-commit: 88fe49249c99de14e543c632a46248d85411ab9e
-- 
2.25.1