Commit 54a4b2b4 authored Oct 09, 2017 by Takashi Iwai

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: fc90172b ("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>

parent cb02ffc7

sound/usb/line6/podhd.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -301,6 +301,7 @@ static void podhd_disconnect(struct usb_line6 *line6)

		intf = usb_ifnum_to_if(line6->usbdev,
		pod->line6.properties->ctrl_if);
		if (intf)
		usb_driver_release_interface(&podhd_driver, intf);
		}
		}