linux-kernel - Re: [PATCH] Sound: AudioScience HPI: Don't leak firmware if mem alloc fails

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Date:	Fri, 29 Jul 2011 07:36:50 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Jesper Juhl <jj@...osbits.net>
Cc:	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	Joe Perches <joe@...ches.com>,
	Eliot Blennerhassett <eblennerhassett@...ioscience.com>,
	Jaroslav Kysela <perex@...ex.cz>, support@...ioscience.com
Subject: Re: [PATCH] Sound: AudioScience HPI: Don't leak firmware if mem alloc fails

At Thu, 28 Jul 2011 21:48:27 +0200 (CEST),
Jesper Juhl wrote:
> 
> We leak the memory allocated to 'firmware' when we fail to
> release_firmware() after a kmalloc() failure in hpi_dsp_code_open().
> This patch should take care of the leak.
> 
> Signed-off-by: Jesper Juhl <jj@...osbits.net>
> ---
>  sound/pci/asihpi/hpidspcd.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> 	Build tested only.
> 
> diff --git a/sound/pci/asihpi/hpidspcd.c b/sound/pci/asihpi/hpidspcd.c
> index 3a7afa3..8d261ef 100644
> --- a/sound/pci/asihpi/hpidspcd.c
> +++ b/sound/pci/asihpi/hpidspcd.c
> @@ -85,8 +85,10 @@ short hpi_dsp_code_open(u32 adapter, void *os_data, struct dsp_code *dsp_code,
>  
>  	HPI_DEBUG_LOG(DEBUG, "dsp code %s opened\n", fw_name);
>  	dsp_code->pvt = kmalloc(sizeof(*dsp_code->pvt), GFP_KERNEL);
> -	if (!dsp_code->pvt)
> +	if (!dsp_code->pvt) {
> +		release_firmware(firmware);
>  		return HPI_ERROR_MEMORY_ALLOC;
> +	}

IMO, it's better to use the same error handling like others, i.e.
"goto error2".  But you want to pass a different error code, so we'd
need to introduce an error code variable there...


Takashi
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