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From: Rob Clark <robdclark@gmail.com>
To: alsa-devel@alsa-project.org
Cc: Stephen Boyd <swboyd@chromium.org>,
	Derek Fang <derek.fang@realtek.com>,
	linux-arm-msm@vger.kernel.org, Rob Clark <robdclark@chromium.org>,
	Oder Chiou <oder_chiou@realtek.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>,
	Takashi Iwai <tiwai@suse.com>,
	linux-kernel@vger.kernel.org (open list)
Subject: [PATCH 1/2] ASoC: rt5682: Fix crash due to out of scope stack vars
Date: Wed, 17 Nov 2021 17:04:52 -0800	[thread overview]
Message-ID: <20211118010453.843286-1-robdclark@gmail.com> (raw)

From: Rob Clark <robdclark@chromium.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@chromium.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


WARNING: multiple messages have this Message-ID (diff)
From: Rob Clark <robdclark@gmail.com>
To: alsa-devel@alsa-project.org
Cc: Rob Clark <robdclark@chromium.org>,
	Oder Chiou <oder_chiou@realtek.com>,
	linux-arm-msm@vger.kernel.org, Takashi Iwai <tiwai@suse.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Stephen Boyd <swboyd@chromium.org>,
	Mark Brown <broonie@kernel.org>,
	Derek Fang <derek.fang@realtek.com>,
	open list <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/2] ASoC: rt5682: Fix crash due to out of scope stack vars
Date: Wed, 17 Nov 2021 17:04:52 -0800	[thread overview]
Message-ID: <20211118010453.843286-1-robdclark@gmail.com> (raw)

From: Rob Clark <robdclark@chromium.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@chromium.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


             reply	other threads:[~2021-11-18  0:59 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-18  1:04 Rob Clark [this message]
2021-11-18  1:04 ` [PATCH 1/2] ASoC: rt5682: Fix crash due to out of scope stack vars Rob Clark
2021-11-18  1:04 ` [PATCH 2/2] ASoC: rt5682s: " Rob Clark
2021-11-18  1:04   ` Rob Clark
2021-11-18  1:36   ` Stephen Boyd
2021-11-18  1:36     ` Stephen Boyd
2021-11-18  1:36 ` [PATCH 1/2] ASoC: rt5682: " Stephen Boyd
2021-11-18  1:36   ` Stephen Boyd
2021-11-27  1:29 ` Mark Brown
2021-11-27  1:29   ` Mark Brown

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