USB: serial: garmin_gps: annotate struct garmin_packet with __counted_by

Use the __counted_by compiler attribute for the data[] flexible array
member to improve the results of array bound sanitizers.

Reviewed-by: Nathan Chancellor <[email protected]>
Signed-off-by: Javier Carrasco <[email protected]>
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Signed-off-by: Johan Hovold <[email protected]>

Author: javiercarrascocruz

drivers/usb/serial/garmin_gps.c

@@ -104,7 +104,7 @@ struct garmin_packet {
 	int               seq;
 	/* the real size of the data array, always > 0 */
 	int               size;
-	__u8              data[];
+	__u8              data[] __counted_by(size);
 };
 
 /* structure used to keep the current state of the driver */