ALSA: usb-audio: Fix control 'access overflow' errors from chmap

The current channel-map control implementation in USB-audio driver may
lead to an error message like
  "control 3:0:0:Playback Channel Map:0: access overflow"
when CONFIG_SND_CTL_VALIDATION is set.  It's because the chmap get
callback clears the whole array no matter which count is set, and
rather the false-positive detection.

This patch fixes the problem by clearing only the needed array range
at usb_chmap_ctl_get().

Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20201211130048.6358-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index ca76ba5b5c0b2a848266208ee1135a8eb6210d27..2f6d39c2ba7c8e40274f48cdd77d45c477e80325 100644 (file)
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -193,16 +193,16 @@ static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
        struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
        struct snd_usb_substream *subs = info->private_data;
        struct snd_pcm_chmap_elem *chmap = NULL;
-       int i;
+       int i = 0;
 
-       memset(ucontrol->value.integer.value, 0,
-              sizeof(ucontrol->value.integer.value));
        if (subs->cur_audiofmt)
                chmap = subs->cur_audiofmt->chmap;
        if (chmap) {
                for (i = 0; i < chmap->channels; i++)
                        ucontrol->value.integer.value[i] = chmap->map[i];
        }
+       for (; i < subs->channels_max; i++)
+               ucontrol->value.integer.value[i] = 0;
        return 0;
 }