linux-kernel - Re: [PATCH] sound: Fix memory leak on error in snd_compr_set

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Message-ID: <s5h8vkx18bo.wl%tiwai@suse.de>
Date:	Tue, 24 Jan 2012 15:30:51 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	Vinod Koul <vinod.koul@...ux.intel.com>,
	Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
	Jaroslav Kysela <perex@...ex.cz>
Subject: Re: [PATCH] sound: Fix memory leak on error in snd_compr_set_params()

At Mon, 23 Jan 2012 21:02:57 +0100 (CET),
Jesper Juhl wrote:
> 
> If copy_from_user() does not return 0 we'll leak the memory we
> allocated for 'params' when that variable goes out of scope.
> 
> Also a small CodingStyle cleanup: Use braces on both branches of
> if/else when one branch needs it.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>

Thanks, applied now.


Takashi

> ---
>  sound/core/compress_offload.c |   13 ++++++++-----
>  1 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
> index dac3633..a68aed7 100644
> --- a/sound/core/compress_offload.c
> +++ b/sound/core/compress_offload.c
> @@ -441,19 +441,22 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
>  		params = kmalloc(sizeof(*params), GFP_KERNEL);
>  		if (!params)
>  			return -ENOMEM;
> -		if (copy_from_user(params, (void __user *)arg, sizeof(*params)))
> -			return -EFAULT;
> +		if (copy_from_user(params, (void __user *)arg, sizeof(*params))) {
> +			retval = -EFAULT;
> +			goto out;
> +		}
>  		retval = snd_compr_allocate_buffer(stream, params);
>  		if (retval) {
> -			kfree(params);
> -			return -ENOMEM;
> +			retval = -ENOMEM;
> +			goto out;
>  		}
>  		retval = stream->ops->set_params(stream, params);
>  		if (retval)
>  			goto out;
>  		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
> -	} else
> +	} else {
>  		return -EPERM;
> +	}
>  out:
>  	kfree(params);
>  	return retval;
> -- 
> 1.7.8.4
> 
> 
> -- 
> Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
> Don't top-post http://www.catb.org/jargon/html/T/top-post.html
> Plain text mails only, please.
> 
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