linux-kernel - [PATCH 1/2] ASoC: rt5682: Fix crash due to out of scope stack vars

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Date:   Wed, 17 Nov 2021 17:04:52 -0800
From:   Rob Clark <robdclark@...il.com>
To:     alsa-devel@...a-project.org
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Derek Fang <derek.fang@...ltek.com>,
        linux-arm-msm@...r.kernel.org, Rob Clark <robdclark@...omium.org>,
        Oder Chiou <oder_chiou@...ltek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/2] ASoC: rt5682: Fix crash due to out of scope stack vars

From: Rob Clark <robdclark@...omium.org>

Move the declaration of temporary arrays to somewhere that won't go out
of scope before the devm_clk_hw_register() call, lest we be at the whim
of the compiler for whether those stack variables get overwritten.

Fixes a crash seen with gcc version 11.2.1 20210728 (Red Hat 11.2.1-1)

Fixes: edbd24ea1e5c ("ASoC: rt5682: Drop usage of __clk_get_name()")
Signed-off-by: Rob Clark <robdclark@...omium.org>
---
 sound/soc/codecs/rt5682.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c
index 78b4cb5fb6c8..0d59ec2a5460 100644
--- a/sound/soc/codecs/rt5682.c
+++ b/sound/soc/codecs/rt5682.c
@@ -2844,6 +2844,8 @@ int rt5682_register_dai_clks(struct rt5682_priv *rt5682)
 
 	for (i = 0; i < RT5682_DAI_NUM_CLKS; ++i) {
 		struct clk_init_data init = { };
+		struct clk_parent_data parent_data;
+		const struct clk_hw *parent;
 
 		dai_clk_hw = &rt5682->dai_clks_hw[i];
 
@@ -2851,17 +2853,17 @@ int rt5682_register_dai_clks(struct rt5682_priv *rt5682)
 		case RT5682_DAI_WCLK_IDX:
 			/* Make MCLK the parent of WCLK */
 			if (rt5682->mclk) {
-				init.parent_data = &(struct clk_parent_data){
+				parent_data = (struct clk_parent_data){
 					.fw_name = "mclk",
 				};
+				init.parent_data = &parent_data;
 				init.num_parents = 1;
 			}
 			break;
 		case RT5682_DAI_BCLK_IDX:
 			/* Make WCLK the parent of BCLK */
-			init.parent_hws = &(const struct clk_hw *){
-				&rt5682->dai_clks_hw[RT5682_DAI_WCLK_IDX]
-			};
+			parent = &rt5682->dai_clks_hw[RT5682_DAI_WCLK_IDX];
+			init.parent_hws = &parent;
 			init.num_parents = 1;
 			break;
 		default:
-- 
2.33.1