ALSA: usb-audio: Fix control 'access overflow' errors from chmap
stable inclusion from stable-5.10.2 commit f1e6ab052c63a3bf3871aa2a8ec846feb7a77be2 bugzilla: 46859 -------------------------------- commit c6dde8ff 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.deSigned-off-by: NTakashi Iwai <tiwai@suse.de> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: NXie XiuQi <xiexiuqi@huawei.com> Signed-off-by: NChen Jun <chenjun102@huawei.com>
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