ALSA: hda: Fix potential access overflow in beep helper

commit 0ad3f0b384d58f3bd1f4fb87d0af5b8f6866f41a upstream.

The beep control helper function blindly stores the values in two
stereo channels no matter whether the actual control is mono or
stereo.  This is practically harmless, but it annoys the recently
introduced sanity check, resulting in an error when the checker is
enabled.

This patch corrects the behavior to store only on the defined array
member.

Fixes: 0401e8548eac ("ALSA: hda - Move beep helper functions to hda_beep.c")
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207139
Reviewed-by: Jaroslav Kysela <perex@perex.cz>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200407084402.25589-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
index c397e7da0eacf9808d136ccdb8ef40e583e58b19..7ccfb09535e14acf46193a4423fa38d4f9893976 100644 (file)
--- a/sound/pci/hda/hda_beep.c
+++ b/sound/pci/hda/hda_beep.c
@@ -310,8 +310,12 @@ int snd_hda_mixer_amp_switch_get_beep(struct snd_kcontrol *kcontrol,
 {
        struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
        struct hda_beep *beep = codec->beep;
+       int chs = get_amp_channels(kcontrol);
+
        if (beep && (!beep->enabled || !ctl_has_mute(kcontrol))) {
-               ucontrol->value.integer.value[0] =
+               if (chs & 1)
+                       ucontrol->value.integer.value[0] = beep->enabled;
+               if (chs & 2)
                        ucontrol->value.integer.value[1] = beep->enabled;
                return 0;
        }