netdev - Re: Bug: tc filter show .... raise segfault if more than one rule with action -j MARK exist

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Date:	Fri, 9 May 2014 13:34:24 -0700
From:	Stephen Hemminger <stephen@...workplumber.org>
To:	andreas.greve@...reve.de
Cc:	netdev@...r.kernel.org
Subject: Re: Bug: tc filter show .... raise segfault if more than one rule
 with action -j MARK exist

On Thu, 08 May 2014 13:48:19 +0200
Andreas Greve <andreas.greve@...reve.de> wrote:

> +	/* 
> +	   clone tcipt_globals because .opts and .options_offset  will be modified later and not 
> +           restored by iptables. If tcipt_globals is not cloned the modification tcipt_globals will 
> +           cause a segmentation fault if more than one filter rule  with action -j  exists.
> +        */
> +	struct xtables_globals tmp_tcipt_globals;
> +	memcpy (&tmp_tcipt_globals, &tcipt_globals, sizeof(struct xtables_globals) );
> +

Please use structure assignment instead of memcpy().
Structure assignment makes sure that types match. mempcpy does not.
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