linux-kernel - Re: [PATCH] ALSA: usb-audio: Fix double-free in snd_usb_add_audio

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Date:	Thu, 31 Mar 2016 03:38:11 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Vladis Dronov <vdronov@...hat.com>
Cc:	kbuild-all@...org, Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org,
	Vladis Dronov <vdronov@...hat.com>
Subject: Re: [PATCH] ALSA: usb-audio: Fix double-free in
 snd_usb_add_audio_stream()

Hi Vladis,

[auto build test WARNING on sound/for-next]
[also build test WARNING on v4.6-rc1 next-20160330]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]

url:    https://github.com/0day-ci/linux/commits/Vladis-Dronov/ALSA-usb-audio-Fix-double-free-in-snd_usb_add_audio_stream/20160331-030636
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
config: x86_64-acpi-redef (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   sound/usb/quirks.c: In function 'create_fixed_stream_quirk':
>> sound/usb/quirks.c:204:2: warning: label 'error_after_add_audio_stream' defined but not used [-Wunused-label]
     error_after_add_audio_stream:
     ^

vim +/error_after_add_audio_stream +204 sound/usb/quirks.c

   188		 */
   189	
   190		fp->protocol = altsd->bInterfaceProtocol;
   191	
   192		if (fp->datainterval == 0)
   193			fp->datainterval = snd_usb_parse_datainterval(chip, alts);
   194		if (fp->maxpacksize == 0)
   195			fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
   196		usb_set_interface(chip->dev, fp->iface, 0);
   197		snd_usb_init_pitch(chip, fp->iface, alts, fp);
   198		snd_usb_init_sample_rate(chip, fp->iface, alts, fp, fp->rate_max);
   199		return 0;
   200	
   201	 error:
   202		kfree(fp);
   203		kfree(rate_table);
 > 204	 error_after_add_audio_stream:
   205		return err;
   206	}
   207	
   208	static int create_auto_pcm_quirk(struct snd_usb_audio *chip,
   209					 struct usb_interface *iface,
   210					 struct usb_driver *driver)
   211	{
   212		struct usb_host_interface *alts;

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