linux-kernel - Re: [PATCH] sound:pci:Change return type of function,shift_bits in xonar

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Date:	Thu, 12 Mar 2015 07:33:20 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Nicholas Krause <xerofoify@...il.com>
Cc:	clemens@...isch.de, perex@...ex.cz, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sound:pci:Change return type of function,shift_bits in xonar_dg.c to avoid overflow

At Thu, 12 Mar 2015 00:35:46 -0400,
Nicholas Krause wrote:
> 
> This changes the return type of the function,shift_bits to unsigned
> long in order to avoid overflowing issues with this function when
> called as found when running sparse on the kernel source tree.

What overflows exactly?  Did you follow the code?


thanks,

Takashi

> 
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  sound/pci/oxygen/xonar_dg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/sound/pci/oxygen/xonar_dg.c b/sound/pci/oxygen/xonar_dg.c
> index 4cf3200..2337a76 100644
> --- a/sound/pci/oxygen/xonar_dg.c
> +++ b/sound/pci/oxygen/xonar_dg.c
> @@ -238,7 +238,7 @@ void set_cs4245_adc_params(struct oxygen *chip,
>  	cs4245_write_spi(chip, CS4245_MCLK_FREQ);
>  }
>  
> -static inline unsigned int shift_bits(unsigned int value,
> +static inline unsigned long shift_bits(unsigned int value,
>  				      unsigned int shift_from,
>  				      unsigned int shift_to,
>  				      unsigned int mask)
> -- 
> 2.1.0
> 
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