commit ab58d8cc870ef3f0771c197700441936898d1f1d
author Peter Wu <peter@lekensteyn.nl> Mon Jul 11 19:51:06 2016 +0200
committer Takashi Iwai <tiwai@suse.de> Mon Jul 11 20:07:46 2016 +0200
tree 41f7edec506cd28202c41de3637337e0d8dfcf8d
parent a8ff48cb70835f48de5703052760312019afea55

ALSA: hda - fix use-after-free after module unload

register_vga_switcheroo() sets the PM ops from the hda structure which
is freed later in azx_free. Make sure that these ops are cleared.

Caught by KASAN, initially noticed due to a general protection fault.

Fixes: 246efa4a072f ("snd/hda: add runtime suspend/resume on optimus support (v4)")
Signed-off-by: Peter Wu <peter@lekensteyn.nl>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>