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* [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer problem
@ 2018-11-02 15:18 Arnd Bergmann
  2018-11-02 16:01 ` Charles Keepax
  2018-11-05 11:59 ` Applied "ASoC: wm97xx: fix uninitialized regmap pointer problem" to the asoc tree Mark Brown
  0 siblings, 2 replies; 3+ messages in thread
From: Arnd Bergmann @ 2018-11-02 15:18 UTC (permalink / raw)
  To: Liam Girdwood, Mark Brown, Jaroslav Kysela, Takashi Iwai
  Cc: Robert Jarzmik, Arnd Bergmann, Kuninori Morimoto, Charles Keepax,
	Marcel Ziswiler, Fabio Estevam, alsa-devel, linux-kernel,
	patches

gcc notices that without either the ac97 bus or the pdata, we never
initialize the regmap pointer, which leads to an uninitialized variable
access:

sound/soc/codecs/wm9712.c: In function 'wm9712_soc_probe':
sound/soc/codecs/wm9712.c:666:2: error: 'regmap' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Since that configuration is invalid, it's better to return an error
here. I tried to avoid adding complexity to the conditions, and turned
the #ifdef into a regular if(IS_ENABLED()) check for readability.
This in turn requires moving some header file declarations out of
an #ifdef.

The same code is used in three drivers, all of which I'm changing
the same way.

Fixes: 2ed1a8e0ce8d ("ASoC: wm9712: add ac97 new bus support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
v2: fix a missing check that Charles pointed out
---
 include/sound/soc.h       |  2 +-
 sound/soc/codecs/wm9705.c | 10 ++++------
 sound/soc/codecs/wm9712.c | 10 ++++------
 sound/soc/codecs/wm9713.c | 10 ++++------
 4 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 70c10a8f3e90..3e0ac310a3df 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -553,12 +553,12 @@ static inline void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 }
 #endif
 
-#ifdef CONFIG_SND_SOC_AC97_BUS
 struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component);
 struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
 	unsigned int id, unsigned int id_mask);
 void snd_soc_free_ac97_component(struct snd_ac97 *ac97);
 
+#ifdef CONFIG_SND_SOC_AC97_BUS
 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);
 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
 		struct platform_device *pdev);
diff --git a/sound/soc/codecs/wm9705.c b/sound/soc/codecs/wm9705.c
index ccdf088461b7..54c306707c02 100644
--- a/sound/soc/codecs/wm9705.c
+++ b/sound/soc/codecs/wm9705.c
@@ -325,8 +325,7 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 	if (wm9705->mfd_pdata) {
 		wm9705->ac97 = wm9705->mfd_pdata->ac97;
 		regmap = wm9705->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		wm9705->ac97 = snd_soc_new_ac97_component(component, WM9705_VENDOR_ID,
 						      WM9705_VENDOR_ID_MASK);
 		if (IS_ERR(wm9705->ac97)) {
@@ -339,7 +338,8 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9705->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_set_drvdata(component, wm9705->ac97);
@@ -350,14 +350,12 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 
 static void wm9705_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9705_priv *wm9705 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9705->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9705->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9705->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9705 = {
diff --git a/sound/soc/codecs/wm9712.c b/sound/soc/codecs/wm9712.c
index e873baa9e778..01949eaba4fd 100644
--- a/sound/soc/codecs/wm9712.c
+++ b/sound/soc/codecs/wm9712.c
@@ -642,8 +642,7 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 	if (wm9712->mfd_pdata) {
 		wm9712->ac97 = wm9712->mfd_pdata->ac97;
 		regmap = wm9712->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		int ret;
 
 		wm9712->ac97 = snd_soc_new_ac97_component(component, WM9712_VENDOR_ID,
@@ -660,7 +659,8 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9712->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_init_regmap(component, regmap);
@@ -673,14 +673,12 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 
 static void wm9712_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9712_priv *wm9712 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9712->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9712->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9712->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9712 = {
diff --git a/sound/soc/codecs/wm9713.c b/sound/soc/codecs/wm9713.c
index 643863bb32e0..5a2fdf4f69bf 100644
--- a/sound/soc/codecs/wm9713.c
+++ b/sound/soc/codecs/wm9713.c
@@ -1214,8 +1214,7 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 	if (wm9713->mfd_pdata) {
 		wm9713->ac97 = wm9713->mfd_pdata->ac97;
 		regmap = wm9713->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		wm9713->ac97 = snd_soc_new_ac97_component(component, WM9713_VENDOR_ID,
 						      WM9713_VENDOR_ID_MASK);
 		if (IS_ERR(wm9713->ac97))
@@ -1225,7 +1224,8 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9713->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_init_regmap(component, regmap);
@@ -1238,14 +1238,12 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 
 static void wm9713_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9713_priv *wm9713 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9713->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9713->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9713->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9713 = {
-- 
2.18.0


^ permalink raw reply related	[flat|nested] 3+ messages in thread
* Re: [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer problem
  2018-11-02 15:18 [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer problem Arnd Bergmann
@ 2018-11-02 16:01 ` Charles Keepax
  2018-11-05 11:59 ` Applied "ASoC: wm97xx: fix uninitialized regmap pointer problem" to the asoc tree Mark Brown
  1 sibling, 0 replies; 3+ messages in thread
From: Charles Keepax @ 2018-11-02 16:01 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: Liam Girdwood, Mark Brown, Jaroslav Kysela, Takashi Iwai,
	Robert Jarzmik, Kuninori Morimoto, Marcel Ziswiler,
	Fabio Estevam, alsa-devel, linux-kernel, patches

On Fri, Nov 02, 2018 at 04:18:21PM +0100, Arnd Bergmann wrote:
> gcc notices that without either the ac97 bus or the pdata, we never
> initialize the regmap pointer, which leads to an uninitialized variable
> access:
> 
> sound/soc/codecs/wm9712.c: In function 'wm9712_soc_probe':
> sound/soc/codecs/wm9712.c:666:2: error: 'regmap' may be used uninitialized in this function [-Werror=maybe-uninitialized]
> 
> Since that configuration is invalid, it's better to return an error
> here. I tried to avoid adding complexity to the conditions, and turned
> the #ifdef into a regular if(IS_ENABLED()) check for readability.
> This in turn requires moving some header file declarations out of
> an #ifdef.
> 
> The same code is used in three drivers, all of which I'm changing
> the same way.
> 
> Fixes: 2ed1a8e0ce8d ("ASoC: wm9712: add ac97 new bus support")
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>

Thanks,
Charles

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Applied "ASoC: wm97xx: fix uninitialized regmap pointer problem" to the asoc tree
  2018-11-02 15:18 [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer problem Arnd Bergmann
  2018-11-02 16:01 ` Charles Keepax
@ 2018-11-05 11:59 ` Mark Brown
  1 sibling, 0 replies; 3+ messages in thread
From: Mark Brown @ 2018-11-05 11:59 UTC (permalink / raw)
  To: Arnd Bergmann
  Cc: Mark Brown, Liam Girdwood, Mark Brown, Jaroslav Kysela,
	Takashi Iwai, alsa-devel, Charles Keepax, Kuninori Morimoto,
	Marcel Ziswiler, patches, linux-kernel, Fabio Estevam,
	Robert Jarzmik, alsa-devel

The patch

   ASoC: wm97xx: fix uninitialized regmap pointer problem

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From 576ce4075bfa0f03e0e91a89eecc539b3b828b08 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 2 Nov 2018 16:18:21 +0100
Subject: [PATCH] ASoC: wm97xx: fix uninitialized regmap pointer problem

gcc notices that without either the ac97 bus or the pdata, we never
initialize the regmap pointer, which leads to an uninitialized variable
access:

sound/soc/codecs/wm9712.c: In function 'wm9712_soc_probe':
sound/soc/codecs/wm9712.c:666:2: error: 'regmap' may be used uninitialized in this function [-Werror=maybe-uninitialized]

Since that configuration is invalid, it's better to return an error
here. I tried to avoid adding complexity to the conditions, and turned
the #ifdef into a regular if(IS_ENABLED()) check for readability.
This in turn requires moving some header file declarations out of
an #ifdef.

The same code is used in three drivers, all of which I'm changing
the same way.

Fixes: 2ed1a8e0ce8d ("ASoC: wm9712: add ac97 new bus support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 include/sound/soc.h       |  2 +-
 sound/soc/codecs/wm9705.c | 10 ++++------
 sound/soc/codecs/wm9712.c | 10 ++++------
 sound/soc/codecs/wm9713.c | 10 ++++------
 4 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index f1dab1f4b194..5a8b84140f01 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -553,12 +553,12 @@ static inline void snd_soc_jack_free_gpios(struct snd_soc_jack *jack, int count,
 }
 #endif
 
-#ifdef CONFIG_SND_SOC_AC97_BUS
 struct snd_ac97 *snd_soc_alloc_ac97_component(struct snd_soc_component *component);
 struct snd_ac97 *snd_soc_new_ac97_component(struct snd_soc_component *component,
 	unsigned int id, unsigned int id_mask);
 void snd_soc_free_ac97_component(struct snd_ac97 *ac97);
 
+#ifdef CONFIG_SND_SOC_AC97_BUS
 int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);
 int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
 		struct platform_device *pdev);
diff --git a/sound/soc/codecs/wm9705.c b/sound/soc/codecs/wm9705.c
index ccdf088461b7..54c306707c02 100644
--- a/sound/soc/codecs/wm9705.c
+++ b/sound/soc/codecs/wm9705.c
@@ -325,8 +325,7 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 	if (wm9705->mfd_pdata) {
 		wm9705->ac97 = wm9705->mfd_pdata->ac97;
 		regmap = wm9705->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		wm9705->ac97 = snd_soc_new_ac97_component(component, WM9705_VENDOR_ID,
 						      WM9705_VENDOR_ID_MASK);
 		if (IS_ERR(wm9705->ac97)) {
@@ -339,7 +338,8 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9705->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_set_drvdata(component, wm9705->ac97);
@@ -350,14 +350,12 @@ static int wm9705_soc_probe(struct snd_soc_component *component)
 
 static void wm9705_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9705_priv *wm9705 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9705->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9705->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9705->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9705 = {
diff --git a/sound/soc/codecs/wm9712.c b/sound/soc/codecs/wm9712.c
index e873baa9e778..01949eaba4fd 100644
--- a/sound/soc/codecs/wm9712.c
+++ b/sound/soc/codecs/wm9712.c
@@ -642,8 +642,7 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 	if (wm9712->mfd_pdata) {
 		wm9712->ac97 = wm9712->mfd_pdata->ac97;
 		regmap = wm9712->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		int ret;
 
 		wm9712->ac97 = snd_soc_new_ac97_component(component, WM9712_VENDOR_ID,
@@ -660,7 +659,8 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9712->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_init_regmap(component, regmap);
@@ -673,14 +673,12 @@ static int wm9712_soc_probe(struct snd_soc_component *component)
 
 static void wm9712_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9712_priv *wm9712 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9712->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9712->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9712->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9712 = {
diff --git a/sound/soc/codecs/wm9713.c b/sound/soc/codecs/wm9713.c
index 643863bb32e0..5a2fdf4f69bf 100644
--- a/sound/soc/codecs/wm9713.c
+++ b/sound/soc/codecs/wm9713.c
@@ -1214,8 +1214,7 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 	if (wm9713->mfd_pdata) {
 		wm9713->ac97 = wm9713->mfd_pdata->ac97;
 		regmap = wm9713->mfd_pdata->regmap;
-	} else {
-#ifdef CONFIG_SND_SOC_AC97_BUS
+	} else if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS)) {
 		wm9713->ac97 = snd_soc_new_ac97_component(component, WM9713_VENDOR_ID,
 						      WM9713_VENDOR_ID_MASK);
 		if (IS_ERR(wm9713->ac97))
@@ -1225,7 +1224,8 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 			snd_soc_free_ac97_component(wm9713->ac97);
 			return PTR_ERR(regmap);
 		}
-#endif
+	} else {
+		return -ENXIO;
 	}
 
 	snd_soc_component_init_regmap(component, regmap);
@@ -1238,14 +1238,12 @@ static int wm9713_soc_probe(struct snd_soc_component *component)
 
 static void wm9713_soc_remove(struct snd_soc_component *component)
 {
-#ifdef CONFIG_SND_SOC_AC97_BUS
 	struct wm9713_priv *wm9713 = snd_soc_component_get_drvdata(component);
 
-	if (!wm9713->mfd_pdata) {
+	if (IS_ENABLED(CONFIG_SND_SOC_AC97_BUS) && !wm9713->mfd_pdata) {
 		snd_soc_component_exit_regmap(component);
 		snd_soc_free_ac97_component(wm9713->ac97);
 	}
-#endif
 }
 
 static const struct snd_soc_component_driver soc_component_dev_wm9713 = {
-- 
2.19.0.rc2


^ permalink raw reply related	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-11-05 11:59 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2018-11-02 15:18 [PATCH] [v2] ASoC: wm97xx: fix uninitialized regmap pointer problem Arnd Bergmann
2018-11-02 16:01 ` Charles Keepax
2018-11-05 11:59 ` Applied "ASoC: wm97xx: fix uninitialized regmap pointer problem" to the asoc tree Mark Brown

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