tree b78c8885b59e950139011c893f429970067bd7d7
parent 880c971350ebe1c9a71a8b24cb9f2acc7551d41e
author Takashi Iwai <tiwai@suse.de> 1524549367 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1525212786 -0700

ALSA: opl3: Hardening for potential Spectre v1

commit 7f054a5bee0987f1e2d4e59daea462421c76f2cb upstream.

As recently Smatch suggested, one place in OPL3 driver may expand the
array directly from the user-space value with speculation:
  sound/drivers/opl3/opl3_synth.c:476 snd_opl3_set_voice() warn: potential spectre issue 'snd_opl3_regmap'

This patch puts array_index_nospec() for hardening against it.

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>