linux-kernel - Re: [tip PATCH] futex: fix futex_wait

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Date:	Fri, 10 Apr 2009 18:33:38 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Darren Hart <dvhltc@...ibm.com>
cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [tip PATCH] futex: fix futex_wait_setup key handling

On Fri, 10 Apr 2009, Darren Hart wrote:

> If the get_futex_key() call were to fail, the existing code would
> try and put_futex_key() prior to returning.  This patch makes sure
> we only put_futex_key() if get_futex_key() succeeded.
> 
> Please apply to -rt and to tip:/core/futexes.
> 
> Reported-by: Clark Williams <williams@...hat.com>
> Signed-off-by: Darren Hart <dvhltc@...ibm.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...e.hu>
> ---
> 
>  kernel/futex.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/futex.c b/kernel/futex.c
> index 185c981..4357f06 100644
> --- a/kernel/futex.c
> +++ b/kernel/futex.c
> @@ -1657,7 +1657,7 @@ retry_private:
>  
>  		ret = get_user(uval, uaddr);
>  		if (ret)
> -			goto out;
> +			goto out_put_key;
>  
>  		if (!fshared)
>  			goto retry_private;
> @@ -1671,9 +1671,10 @@ retry_private:
>  		ret = -EWOULDBLOCK;
>  	}
>  
> -out:
> +out_put_key:
>  	if (ret)
>  		put_futex_key(fshared, &q->key);
> +out:
>  	return ret;

Yikes. Can we please convert the places which do "goto out;" to
"return ret;" ?

Thanks,

	tglx
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