linux-kernel - [PATCH] ASoC: cs42l73: don't use negative array index

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Message-ID: <alpine.LNX.2.00.1204122152340.7553@swampdragon.chaosbits.net>
Date:	Thu, 12 Apr 2012 21:54:34 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	linux-kernel@...r.kernel.org
cc:	alsa-devel@...a-project.org,
	Vinod Koul <vinod.koul@...ux.intel.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Brian Austin <brian.austin@...rus.com>,
	Axel Lin <axel.lin@...il.com>, Takashi Iwai <tiwai@...e.de>,
	Jaroslav Kysela <perex@...ex.cz>, Liam Girdwood <lrg@...com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	joe@...leusys.com, brian.austin@...rus.com
Subject: [PATCH] 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@...osbits.net>
---
 sound/soc/codecs/cs42l73.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/cs42l73.c b/sound/soc/codecs/cs42l73.c
index 78979b3..07c44b7 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;
-- 
1.7.10


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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