[alsa-devel] [PATCH 1/2] ASoC: Add BUG() assertion if max98088_get_channel returns -EINVAL

[Ryan Mallon]

On 29/09/11 00:01, Axel Lin wrote:
> The callers use the return value of max98088_get_channel as array index to
> access max98088->dai[] array.
> Add BUG() assertion for out of bound access of max98088->dai[] array.

BUG() is pretty heavy handed for a driver. Why not fix the problem
properly in the callers?

----
Check the return value of max98088_get_channel in the callers and
propagate any errors up.

Signed-off-by: Ryan Mallon <rmallon at gmail.com>
---

diff --git a/sound/soc/codecs/max98088.c b/sound/soc/codecs/max98088.c
index ac65a2d..e07700e 100644
--- a/sound/soc/codecs/max98088.c
+++ b/sound/soc/codecs/max98088.c
@@ -1811,6 +1811,9 @@ static int max98088_put_eq_enum(struct snd_kcontrol *kcontrol,
        struct max98088_cdata *cdata;
        int sel = ucontrol->value.integer.value[0];
 
+       if (channel < 0)
+	       return channel;
+
        cdata = &max98088->dai[channel];
 
        if (sel >= pdata->eq_cfgcnt)
@@ -1838,6 +1841,9 @@ static int max98088_get_eq_enum(struct snd_kcontrol *kcontrol,
        int channel = max98088_get_channel(kcontrol->id.name);
        struct max98088_cdata *cdata;
 
+       if (channel < 0)
+	       return channel;
+
        cdata = &max98088->dai[channel];
        ucontrol->value.enumerated.item[0] = cdata->eq_sel;
        return 0;