linux-kernel - Re: [PATCH] usb-audio: Check for possible chip NULL pointer before clearing probing flag

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Date:	Mon, 26 Sep 2011 15:52:20 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Thomas Pfaff <tpfaff@....net>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	alsa-devel@...a-project.org
Subject: Re: [PATCH] usb-audio: Check for possible chip NULL pointer before clearing probing flag

At Mon, 26 Sep 2011 15:43:59 +0200 (CEST),
Thomas Pfaff wrote:
> 
> Before clearing the probing flag in the error exit path, check that the 
> chip pointer is not NULL.
> 
> Signed-off-by: Thomas Pfaff <tpfaff@....net>

Applied now.  Thanks.


Takashi


> ---
> diff -urp a/sound/usb/card.c b/sound/usb/card.c
> --- a/sound/usb/card.c	2011-09-26 14:58:02.468672118 +0200
> +++ b/sound/usb/card.c	2011-09-26 15:00:30.313110086 +0200
> @@ -530,9 +530,11 @@ snd_usb_audio_probe(struct usb_device *d
>  	return chip;
>  
>   __error:
> -	if (chip && !chip->num_interfaces)
> -		snd_card_free(chip->card);
> -	chip->probing = 0;
> +	if (chip) {
> +		if (!chip->num_interfaces)
> +			snd_card_free(chip->card);
> +		chip->probing = 0;
> +	}
>  	mutex_unlock(&register_mutex);
>   __err_val:
>  	return NULL;
> 
--
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