linux-kernel - Re: [PATCH] regulator: core: fix constraints debug output

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Message-ID: <1432154105.20840.8.camel@perches.com>
Date:	Wed, 20 May 2015 13:35:05 -0700
From:	Joe Perches <joe@...ches.com>
To:	Stefan Wahren <stefan.wahren@...e.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] regulator: core: fix constraints debug output

On Wed, 2015-05-20 at 20:17 +0000, Stefan Wahren wrote:
> In the case uV_offset is greater than 0 the debug output before
> is accidentally overwritten. So take care of the output count.

If you are going to take care, please change all of these
sprintf calls to snprintf.

The buf array may not be big enough [80] to hold the longest
possible output string.

> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
[]
> @@ -801,7 +801,7 @@ static void print_constraints(struct regulator_dev *rdev)
>  	}
>  
>  	if (constraints->uV_offset)
> -		count += sprintf(buf, "%dmV offset ",
> +		count += sprintf(buf + count, "%dmV offset ",
>  				 constraints->uV_offset / 1000);
>  
>  	if (constraints->min_uA && constraints->max_uA) {



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