linux-kernel - Re: [PATCH 18/20] staging/lustre/libcfs: get rid of debugfs/lnet/debug

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Message-ID: <20150708084202.GN4341@mwanda>
Date:	Wed, 8 Jul 2015 11:45:59 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	green@...uxhacker.ru
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org,
	Andreas Dilger <andreas.dilger@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/20] staging/lustre/libcfs: get rid of
 debugfs/lnet/debug_mb

On Mon, Jul 06, 2015 at 12:48:56PM -0400, green@...uxhacker.ru wrote:
> +static int libcfs_param_debug_mb_set(const char *val,
> +				     const struct kernel_param *kp)
> +{
> +	int rc;
> +	unsigned num;
> +
> +	rc = kstrtouint(val, 0, &num);
> +	if (rc == -EINVAL)
> +		return -EINVAL;

Presumably, this is root only so using num uninitialized is not an
information leak.

> +
> +	if (!*((unsigned int *)kp->arg)) {
> +		*((unsigned int *)kp->arg) = num;
> +		return 0;
> +	}
> +
> +	rc = cfs_trace_set_debug_mb(num);
> +
> +	if (!rc)
> +		*((unsigned int *)kp->arg) = cfs_trace_get_debug_mb();
> +
> +	return rc;
> +}

regards,
dan carpenter

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