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ASoC: dapm: Fix possible uninitialized variable in snd_soc_dapm_get_volsw()

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If soc_dapm_read() fails, val will be uninitialized, and bogus values
will be written later:

	ret = soc_dapm_read(dapm, reg, &val);
	val = (val >> shift) & mask;

However, the compiler does not give a warning. Return on error before
val is really used to avoid this.

This is similar to the commit 6912831623 ("ASoC: dapm: Fix
uninitialized variable in snd_soc_dapm_get_enum_double()")

Fixes: ce0fc93ae5 (ASoC: Add DAPM support at the component level)
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Chen-Yu Tsai 2016-08-27 19:27:58 +08:00 committed by Mark Brown
parent 8053f21675
commit 01ad5e7de6
1 changed files with 3 additions and 0 deletions
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3
sound/soc/soc-dapm.c
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@ -3049,6 +3049,9 @@ int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol,
}
mutex_unlock(&card->dapm_mutex);
if (ret)
return ret;
if (invert)
ucontrol->value.integer.value[0] = max - val;
else