usb: device: fix unaligned memory access in Audio class

Use UNALIGNED_*, sys_get_* to fix unaligned memory
access issues

Signed-off-by: ZhongYao Luo <[email protected]>

Author: LuoZhongYao

samples/subsys/usb/audio/headphones_microphone/src/main.c

@@ -53,7 +53,7 @@ static void feature_update(const struct device *dev,
 	case USB_AUDIO_FU_MUTE_CONTROL:
 		break;
 	case USB_AUDIO_FU_VOLUME_CONTROL:
-		volume = *((int16_t *)(evt->val));
+		volume = UNALIGNED_GET((int16_t *)evt->val);
 		LOG_INF("set volume: %d", volume);
 		break;
 	default:

samples/subsys/usb/audio/headset/src/main.c

@@ -51,7 +51,7 @@ static void feature_update(const struct device *dev,
 	case USB_AUDIO_FU_MUTE_CONTROL:
 		break;
 	case USB_AUDIO_FU_VOLUME_CONTROL:
-		volume = *((int16_t *)(evt->val));
+		volume = UNALIGNED_GET((int16_t *)evt->val);
 		LOG_INF("set volume: %d", volume);
 		break;
 	default:

subsys/usb/device/class/audio/audio.c

@@ -577,7 +577,7 @@ static int handle_fu_volume_req(struct usb_audio_dev_data *audio_dev_data,
 			return -EINVAL;
 		}
 		if (setup->bRequest == USB_AUDIO_SET_CUR) {
-			target_vol = *((int16_t *)*data);
+			target_vol = sys_get_le16(*data);
 			if (!IN_RANGE(target_vol, audio_dev_data->volumes.volume_min,
 				      audio_dev_data->volumes.volume_max)) {
 				LOG_ERR("Volume out of range: %d", target_vol);
@@ -587,15 +587,16 @@ static int handle_fu_volume_req(struct usb_audio_dev_data *audio_dev_data,
 				target_vol = ROUND_UP(target_vol,
 					audio_dev_data->volumes.volume_res);
 			}
+
+			UNALIGNED_PUT(target_vol, (int16_t *)control_val);
 			evt->val = control_val;
 			evt->val_len = *len;
-			*((int16_t *)evt->val) = sys_le16_to_cpu(target_vol);
 			return 0;
 		}
 	} else {
 		if (setup->bRequest == USB_AUDIO_GET_CUR) {
 			*len = LEN(ch_cnt, VOLUME);
-			temp_vol = sys_cpu_to_le16(*(int16_t *)control_val);
+			temp_vol = sys_cpu_to_le16(UNALIGNED_GET((int16_t *)control_val));
 			memcpy(*data, &temp_vol, *len);
 			return 0;
 		} else if (setup->bRequest == USB_AUDIO_GET_MIN) {