linux-kernel - Re: [PATCH] alsa: fix comparison of unsigned

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Message-ID: <465D6460.6030003@gmail.com>
Date:	Wed, 30 May 2007 13:47:44 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
CC:	Bill Nottingham <notting@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] alsa: fix comparison of unsigned < 0

Takashi Iwai napsal(a):
> Hi,
> 
> thanks for checking this.
> They seem actually hitting some real bugs.

Bug fixes are ok, but keep on your mind this (I haven't checked if this is
the case):
http://lkml.org/lkml/2006/11/28/206

> At Wed, 30 May 2007 03:35:54 -0400,
> Bill Nottingham wrote:
>> diff -ru linux-2.6.21-old/sound/pci/ac97/ac97_patch.c linux-2.6.21/sound/pci/ac97/ac97_patch.c
>> --- linux-2.6.21-old/sound/pci/ac97/ac97_patch.c	2007-05-30 02:53:05.000000000 -0400
>> +++ linux-2.6.21/sound/pci/ac97/ac97_patch.c	2007-05-30 02:32:41.000000000 -0400
>> @@ -2086,8 +2086,7 @@
>>  	struct snd_ac97 *ac97 = snd_kcontrol_chip(kcontrol);
>>  	unsigned short val;
>>  
>> -	if (ucontrol->value.enumerated.item[0] > 3
>> -	    || ucontrol->value.enumerated.item[0] < 0)
>> +	if (ucontrol->value.enumerated.item[0] > 3)
>>  		return -EINVAL;
>>  	val = ctrl2reg[ucontrol->value.enumerated.item[0]]
>>  	      << AC97_AD198X_VREF_SHIFT;
> 
> This one is fine.
[...]

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
 B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E
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