linux-kernel - Re: [ckrm-tech] [PATCH 6/6] Resource Groups over generic containers

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Date:	Mon, 06 Nov 2006 02:44:31 +0530
From:	Balbir Singh <balbir@...ibm.com>
To:	menage@...gle.com
CC:	sekharan@...ibm.com, ckrm-tech@...ts.sourceforge.net, pj@....com,
	akpm@...l.org, jlan@....com, mbligh@...gle.com,
	rohitseth@...gle.com, winget@...gle.com, Simon.Derr@...l.net,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ckrm-tech] [PATCH 6/6] Resource Groups over generic containers

Hi, Paul,

I've just started playing with the new patchset and found a few issues.

menage@...gle.com wrote:
> +ssize_t res_group_file_write(struct container *cont,
> +				   struct cftype *cft,
> +				   struct file *file,
> +				   const char __user *userbuf,
> +				   size_t nbytes, loff_t *ppos)
> +{
> +	struct res_group_cft *rgcft = container_of(cft, struct res_group_cft, cft);
> +	struct res_controller *ctlr = rgcft->ctlr;
> +
> +	if (nbytes >= PAGE_SIZE)
> +		return -E2BIG;
> +
> +	char *buf;
> +	ssize_t retval;
> +	int filetype = cft->private;
> +
> +	buf = kmalloc(nbytes + 1, GFP_USER);

This should be kmalloc(nbytes), an echo ".." has a "\n" associated
with it.

> +	if (!buf) return -ENOMEM;
> +	if (copy_from_user(buf, userbuf, nbytes)) {
> +		retval = -EFAULT;
> +		goto out1;
> +	}
> +	buf[nbytes] = 0;	/* nul-terminate */
> +

this should be buf[nbytes - 1]



-- 

	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs
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