linux-kernel - Re: [Patch 3/9] fs/compat.c: fix resource leaks and wrong goto's

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Message-ID: <20080510192111.GC13907@ZenIV.linux.org.uk>
Date:	Sat, 10 May 2008 20:21:11 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...l.org>,
	WANG Cong <wangcong@...ux.org>
Subject: Re: [Patch 3/9] fs/compat.c: fix resource leaks and wrong goto's

On Thu, May 08, 2008 at 09:52:28PM +0800, WANG Cong wrote:
> Use free_arg_pages() to free the pages allocated by copy_strings_kernel()
> on failure. And fix some related wrong goto pathes.

Kinda; free_arg_pages() is needed here, but there's no need to mess with
goto - just put it under out:

Note that it's essentially just a part of freeing bprm; it's _not_ a "clean
collected strings, so that we could add new ones".

> @@ -1403,6 +1403,7 @@ int compat_do_execve(char * filename,
>  	retval = search_binary_handler(bprm, regs);
>  	if (retval >= 0) {
>  		/* execve success */
> +		free_arg_pages(bprm);
>  		security_bprm_free(bprm);
>  		acct_update_integrals(current);
>  		kfree(bprm);
> @@ -1410,6 +1411,9 @@ int compat_do_execve(char * filename,
>  	}
>  
>  out:
> +	free_arg_pages(bprm);
> +
> +out_sec:
>  	if (bprm->security)
>  		security_bprm_free(bprm);
>  
--
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