dm vdo: add upfront validation for logical size

Add a validation check that the logical size passed via the table line
does not exceed MAXIMUM_VDO_LOGICAL_BLOCKS.

Signed-off-by: Bruce Johnston <bjohnsto@redhat.com>
Reviewed-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Author: bjohnsto

drivers/md/dm-vdo/dm-vdo-target.c

@@ -792,6 +792,12 @@ static int parse_device_config(int argc, char **argv, struct dm_target *ti,
 	struct device_config *config = NULL;
 	int result;
 
+	if (logical_bytes > (MAXIMUM_VDO_LOGICAL_BLOCKS * VDO_BLOCK_SIZE)) {
+		handle_parse_error(config, error_ptr,
+				   "Logical size exceeds the maximum");
+		return VDO_BAD_CONFIGURATION;
+	}
+
 	if ((logical_bytes % VDO_BLOCK_SIZE) != 0) {
 		handle_parse_error(config, error_ptr,
 				   "Logical size must be a multiple of 4096");