netdev - Re: [patch] fix stack overflow in pktgen_if

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Message-ID: <20101027224057.GP6062@bicker>
Date:	Thu, 28 Oct 2010 00:40:57 +0200
From:	Dan Carpenter <error27@...il.com>
To:	nelhage@...lice.com
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Robert Olsson <robert.olsson@....uu.se>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	netdev@...r.kernel.org
Subject: Re: [patch] fix stack overflow in pktgen_if_write()

On Thu, Oct 28, 2010 at 12:12:35AM +0200, Dan Carpenter wrote:
> -		char tb[count + 1];
> -		if (copy_from_user(tb, user_buffer, count))
> -			return -EFAULT;
> -		tb[count] = 0;
> +		char *tb;
> +
> +		tb = strndup_user(user_buffer, count + 1);

Crap...  This should be memdup_user().

Sorry about that.  I'll send v2.

regards,
dan carpenter

> +		if (IS_ERR(tb))
> +			return PTR_ERR(tb);
>  		printk(KERN_DEBUG "pktgen: %s,%lu  buffer -:%s:-\n", name,
>  		       (unsigned long)count, tb);
> +		kfree(tb);
>  	}
>  
>  	if (!strcmp(name, "min_pkt_size")) {
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