tree 7e3026feb0b68e01e9facf86d6e580993c65dfcd
parent 1e0130b609174a97331e17631883bded42852224
author Takashi Iwai <tiwai@suse.de> 1524549050 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1525212787 -0700

ALSA: hda: Hardening for potential Spectre v1

commit 69fa6f19b95597618ab30438a27b67ad93daa7c7 upstream.

As recently Smatch suggested, one place in HD-audio hwdep ioctl codes
may expand the array directly from the user-space value with
speculation:
  sound/pci/hda/hda_local.h:467 get_wcaps() warn: potential spectre issue 'codec->wcaps'

As get_wcaps() itself is a fairly frequently called inline function,
and there is only one single call with a user-space value, we replace
only the latter one to open-code locally with array_index_nospec()
hardening in this patch.

BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>