ALSA: line6: Fix NULL dereference at podhd_disconnect()
authorTakashi Iwai <tiwai@suse.de>
Mon, 9 Oct 2017 12:26:27 +0000 (14:26 +0200)
committerTakashi Iwai <tiwai@suse.de>
Mon, 9 Oct 2017 14:17:09 +0000 (16:17 +0200)
commit54a4b2b45817ea2365b40c923c098a26af0c0dbb
tree74fce302ae431cb6347539adc5705c73ad58aa0a
parentcb02ffc76a53b5ea751b79b8d4f4d180e5868475
ALSA: line6: Fix NULL dereference at podhd_disconnect()

When podhd_init() failed with the acquiring a ctrl i/f, the line6
helper still calls the disconnect callback that eventually calls again
usb_driver_release_interface() with the NULL intf.

Put the proper NULL check before calling it for avoiding an Oops.

Fixes: fc90172ba283 ("ALSA: line6: Claim pod x3 usb data interface")
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/line6/podhd.c