linux-kernel - Re: [PATCH 2/2] ASoC: Add BUG() assertion if max98095_get_bq

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Date:	Thu, 29 Sep 2011 09:19:06 +1000
From:	Ryan Mallon <rmallon@...il.com>
To:	Axel Lin <axel.lin@...il.com>
CC:	linux-kernel@...r.kernel.org, Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	alsa-devel@...a-project.org,
	Peter Hsiang <peter.hsiang@...im-ic.com>,
	Jesse Marroquin <jesse.marroquin@...im-ic.com>
Subject: Re: [PATCH 2/2] ASoC: Add BUG() assertion if max98095_get_bq_channel
 returns -EINVAL

On 29/09/11 00:02, Axel Lin wrote:
> The callers use the return value of max98095_get_bq_channel as array index to
> access max98095->dai[] array.
> Add BUG() assertion for out of bound access of max98095->dai[] array.

Same here, fix the problem in the callers.

----
Check the return value of max98095_get_bq_channel in the callers and
propagate any errors up. Remove the BUG_ON(channel > 1) since
max98095_get_bq_channel never returns a value larger than 1.

Signed-off-by: Ryan Mallon <rmallon@...il.com>
---

diff --git a/sound/soc/codecs/max98095.c b/sound/soc/codecs/max98095.c
index 668434d..55eccea 100644
--- a/sound/soc/codecs/max98095.c
+++ b/sound/soc/codecs/max98095.c
@@ -2014,7 +2014,8 @@ static int max98095_put_bq_enum(struct snd_kcontrol *kcontrol,
 	int fs, best, best_val, i;
 	int regmask, regsave;
 
-	BUG_ON(channel > 1);
+	if (channel < 0)
+		return channel;
 
 	if (!pdata || !max98095->bq_textcnt)
 		return 0;
@@ -2069,6 +2070,9 @@ static int max98095_get_bq_enum(struct snd_kcontrol *kcontrol,
 	int channel = max98095_get_bq_channel(kcontrol->id.name);
 	struct max98095_cdata *cdata;
 
+	if (channel < 0)
+		return channel;
+
 	cdata = &max98095->dai[channel];
 	ucontrol->value.enumerated.item[0] = cdata->bq_sel;
 

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