Takashi Iwai f1e6ab052c ALSA: usb-audio: Fix control 'access overflow' errors from chmap
commit c6dde8ffd071aea9d1ce64279178e470977b235c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-12-21 13:30:07 +01:00
..
2020-08-21 10:07:54 -07:00
2020-07-09 13:01:29 +02:00
2020-01-28 16:26:57 -08:00
2020-11-27 15:02:30 +01:00
2020-01-05 16:15:13 +01:00
2020-01-05 16:14:46 +01:00