linux-kernel - [PATCH 6/6] sound/drivers/dummy.c: fix negative snd_pcm_format

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Date:	Wed, 16 Apr 2008 18:20:33 +0200
From:	Roel Kluin <12o3l@...cali.nl>
To:	perex@...ex.cz
CC:	alsa-devel@...a-project.org, lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH 6/6] sound/drivers/dummy.c: fix negative snd_pcm_format_width()
 check

bps is unsigned, a negative snd_pcm_format_width() return value is not noticed
    
Signed-off-by: Roel Kluin <12o3l@...cali.nl>
---
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c
index a240eae..1c88977 100644
--- a/sound/drivers/dummy.c
+++ b/sound/drivers/dummy.c
@@ -230,13 +230,14 @@ static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_dummy_pcm *dpcm = runtime->private_data;
-	unsigned int bps;
+	int bps;
+
+	bps = snd_pcm_format_width(runtime->format) * runtime->rate *
+		runtime->channels / 8;
 
-	bps = runtime->rate * runtime->channels;
-	bps *= snd_pcm_format_width(runtime->format);
-	bps /= 8;
 	if (bps <= 0)
 		return -EINVAL;
+
 	dpcm->pcm_bps = bps;
 	dpcm->pcm_jiffie = bps / HZ;
 	dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream);
--
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