linux-kernel - Re: [PATCH] ALSA: lx6464es: Fix memory leaks in snd_lx6464es

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Date:   Mon, 28 Oct 2019 07:30:06 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Navid Emamdoost <navid.emamdoost@...il.com>
Cc:     emamd001@....edu, kjlu@....edu, smccaman@....edu,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Tim Blechmann <tim@...ngt.org>,
        Hariprasad Kelam <hariprasad.kelam@...il.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: lx6464es: Fix memory leaks in snd_lx6464es_create

On Sun, 27 Oct 2019 20:24:13 +0100,
Navid Emamdoost wrote:
> 
> In the implementation of snd_lx6464es_create() it there are memory leaks
> when error happens. Go to error path if any of these calls fail:
> lx_init_dsp(), lx_pcm_create(), lx_proc_create(), snd_ctl_add().

Again no for this patch, it'll lead to double-frees.
After registered via snd_device_new(), the device object gets released
by its callback and the single snd_card_free() call suffices.


thanks,

Takashi

> 
> Fixes: 02bec4904508 ("ALSA: lx6464es - driver for the digigram lx6464es interface")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
>  sound/pci/lx6464es/lx6464es.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/pci/lx6464es/lx6464es.c b/sound/pci/lx6464es/lx6464es.c
> index fe10714380f2..7c6e8f4ef826 100644
> --- a/sound/pci/lx6464es/lx6464es.c
> +++ b/sound/pci/lx6464es/lx6464es.c
> @@ -1020,25 +1020,26 @@ static int snd_lx6464es_create(struct snd_card *card,
>  	err = lx_init_dsp(chip);
>  	if (err < 0) {
>  		dev_err(card->dev, "error during DSP initialization\n");
> -		return err;
> +		goto cleanup;
>  	}
>  
>  	err = lx_pcm_create(chip);
>  	if (err < 0)
> -		return err;
> +		goto cleanup;
>  
>  	err = lx_proc_create(card, chip);
>  	if (err < 0)
> -		return err;
> +		goto cleanup;
>  
>  	err = snd_ctl_add(card, snd_ctl_new1(&lx_control_playback_switch,
>  					     chip));
>  	if (err < 0)
> -		return err;
> +		goto cleanup;
>  
>  	*rchip = chip;
>  	return 0;
>  
> +cleanup:
>  device_new_failed:
>  	free_irq(pci->irq, chip);
>  
> -- 
> 2.17.1
>