linux-kernel - Re: [PATCH 1/3] trusted-keys: another free memory bugfix

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Date:	Mon, 17 Jan 2011 16:01:32 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	safford@...son.ibm.com, David Safford <safford@...ibm.com>,
	jj@...osbits.net, dhowells@...hat.com, jmorris@...ei.org,
	keyrings@...ux-nfs.org, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] trusted-keys: another free memory bugfix

On Mon, 2011-01-17 at 09:39 +0900, Tetsuo Handa wrote:
> Resending in separated mails in case somebody missed that
> there was 3 patches in one mail.
> ----------------------------------------
> From 94e965700f1e401408836d4aa782105483196842 Mon Sep 17 00:00:00 2001
> From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
> Date: Mon, 17 Jan 2011 09:22:47 +0900
> Subject: [PATCH 1/3] trusted-keys: another free memory bugfix
> 
> TSS_rawhmac() forgot to call va_end()/kfree() when data == NULL and
> forgot to call va_end() when crypto_shash_update() < 0.
> Fix these bugs by escaping from the loop using "break"
> (rather than "return"/"goto") in order to make sure that
> va_end()/kfree() are always called.
> 
> Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>

Acked-by: Mimi Zohar <zohar@...ibm.com>

> ---
>  security/keys/trusted_defined.c |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/security/keys/trusted_defined.c b/security/keys/trusted_defined.c
> index 932f868..7b21795 100644
> --- a/security/keys/trusted_defined.c
> +++ b/security/keys/trusted_defined.c
> @@ -101,11 +101,13 @@ static int TSS_rawhmac(unsigned char *digest, const unsigned char *key,
>  		if (dlen == 0)
>  			break;
>  		data = va_arg(argp, unsigned char *);
> -		if (data == NULL)
> -			return -EINVAL;
> +		if (data == NULL) {
> +			ret = -EINVAL;
> +			break;
> +		}
>  		ret = crypto_shash_update(&sdesc->shash, data, dlen);
>  		if (ret < 0)
> -			goto out;
> +			break;
>  	}
>  	va_end(argp);
>  	if (!ret)


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