linux-kernel - Re: [PATCH 1/3] uml: drivers/net

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Date:	Thu, 7 Jul 2011 19:27:15 +0200
From:	Richard Weinberger <richard@....at>
To:	Vitaliy Ivanov <vitalivanov@...il.com>
Cc:	Jeff Dike <jdike@...toit.com>,
	user-mode-linux-devel@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] uml: drivers/net_user.c memory leak fix

Am Donnerstag 07 Juli 2011, 18:36:02 schrieb Vitaliy Ivanov:
> >From 9b9f36f46aa708c3245f5ded83f96421966b2edf Mon Sep 17 00:00:00 2001
> 
> From: Vitaliy Ivanov <vitalivanov@...il.com>
> Date: Thu, 7 Jul 2011 19:23:13 +0300
> Subject: [PATCH 1/3] uml: drivers/net_user.c memory leak fix
> 
> Perform memory cleanup on exit.
> On receiving invalid 'pid' we still should clean 'output' variable.
> 
> Signed-off-by: Vitaliy Ivanov <vitalivanov@...il.com>
> ---
>  arch/um/drivers/net_user.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
> index 9415dd9..989b653 100644
> --- a/arch/um/drivers/net_user.c
> +++ b/arch/um/drivers/net_user.c
> @@ -228,10 +228,11 @@ static void change(char *dev, char *what, unsigned
> char *addr, "buffer\n");
> 
>  	pid = change_tramp(argv, output, output_len);
> -	if (pid < 0) return;
> 
>  	if (output != NULL) {
> -		printk("%s", output);
> +		if (pid >= 0) {
> +			printk("%s", output);
> +		}
>  		kfree(output);
>  	}
>  }

This control logic is a bit strange.
When change_tramp() fails we should not printk() the output variable.

if (pid < 0){
 free(output);
 return;
}

Would be much cleaner.

Thanks,
//richard
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