ASoC: cs42l73: don't use negative array index

If cs42l73_get_mclkx_coeff() returns < 0 (which it can) in
sound/soc/codecs/cs42l73.c::cs42l73_set_mclk(), then we'll be using
the (negative) return value as array index on the very next line of
code - that's bad.

Catch the negative return value and propagate it to the caller (which
checks for it) and things are a bit more sane :-)

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/sound/soc/codecs/cs42l73.c b/sound/soc/codecs/cs42l73.c
index 78979b3e0e9..07c44b71f09 100644
--- a/sound/soc/codecs/cs42l73.c
+++ b/sound/soc/codecs/cs42l73.c
@@ -929,6 +929,8 @@ static int cs42l73_set_mclk(struct snd_soc_dai *dai, unsigned int freq)
 
         /* MCLKX -> MCLK */
         mclkx_coeff = cs42l73_get_mclkx_coeff(freq);
+        if (mclkx_coeff < 0)
+                return mclkx_coeff;
 
         mclk = cs42l73_mclkx_coeffs[mclkx_coeff].mclkx /
                 cs42l73_mclkx_coeffs[mclkx_coeff].ratio;