lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <4B2979E7.7060305@boundarydevices.com>
Date:	Wed, 16 Dec 2009 17:23:03 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	alsa-devel@...a-project.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [alsa-devel] [PATCH] sound/oss/pss: Fix test of unsigned in pss_reset_dsp()
 and pss_download_boot()

Roel Kluin wrote:
> limit and jiffies are unsigned so the test does not work.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Found using coccinelle: http://coccinelle.lip6.fr/
> 
> diff --git a/sound/oss/pss.c b/sound/oss/pss.c
> index 83f5ee2..9325f4d 100644
> --- a/sound/oss/pss.c
> +++ b/sound/oss/pss.c
> @@ -269,7 +269,7 @@ static int pss_reset_dsp(pss_confdata * devc)
>  	unsigned long   i, limit = jiffies + HZ/10;
>  
>  	outw(0x2000, REG(PSS_CONTROL));
> -	for (i = 0; i < 32768 && (limit-jiffies >= 0); i++)

I think
	for (i = 0; i < 32768 && ( (int)(limit-jiffies) >= 0); i++)

works better when jiffies wrap

> +	for (i = 0; i < 32768 && (limit >= jiffies); i++)
>  		inw(REG(PSS_CONTROL));
>  	outw(0x0000, REG(PSS_CONTROL));
>  	return 1;
> @@ -369,11 +369,11 @@ static int pss_download_boot(pss_confdata * devc, unsigned char *block, int size
>  		outw(0, REG(PSS_DATA));
>  
>  		limit = jiffies + HZ/10;
> -		for (i = 0; i < 32768 && (limit - jiffies >= 0); i++)
> +		for (i = 0; i < 32768 && (limit >= jiffies); i++)
>  			val = inw(REG(PSS_STATUS));
>  
>  		limit = jiffies + HZ/10;
> -		for (i = 0; i < 32768 && (limit-jiffies >= 0); i++)
> +		for (i = 0; i < 32768 && (limit >= jiffies); i++)
>  		{
>  			val = inw(REG(PSS_STATUS));
>  			if (val & 0x4000)
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@...a-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
> 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ