linux-kernel - Re: [PATCH v2 6/7] Split remaining calls to call_usermodehelper

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Date:	Sat, 9 Mar 2013 21:42:42 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Lucas De Marchi <lucas.demarchi@...fusion.mobi>
Cc:	lucas.de.marchi@...il.com, David Howells <dhowells@...hat.com>,
	James Morris <james.l.morris@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/7] Split remaining calls to
	call_usermodehelper_fns()

On 03/08, Lucas De Marchi wrote:
>
> @@ -571,9 +572,17 @@ void do_coredump(siginfo_t *siginfo)
>  			goto fail_dropcount;
>  		}
>
> -		retval = call_usermodehelper_fns(helper_argv[0], helper_argv,
> -					NULL, UMH_WAIT_EXEC, umh_pipe_setup,
> -					NULL, &cprm);
> +		sub_info = call_usermodehelper_setup(helper_argv[0],
> +						helper_argv, NULL, GFP_KERNEL,
> +						umh_pipe_setup, NULL, &cprm);
> +		if (!sub_info) {
> +			printk(KERN_WARNING "%s failed to allocate memory\n",
> +			       __func__);

Why?

> +			argv_free(helper_argv);
> +			goto fail_dropcount;
> +		}
> +
> +		retval = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);

I do not really like another argv_free() here... How about

		retval = -ENOMEM;
		info = call_usermodehelper_setup(...);
		if (info)
			retval = call_usermodehelper_fns(...);
		argv_free();

?

Oleg.

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