make MARK target use string_to_number [and thus report range overflows].
diff --git a/extensions/libipt_MARK.c b/extensions/libipt_MARK.c
index 93570d6..9774d45 100644
--- a/extensions/libipt_MARK.c
+++ b/extensions/libipt_MARK.c
@@ -48,8 +48,7 @@
switch (c) {
char *end;
case '1':
- markinfo->mark = strtoul(optarg, &end, 0);
- if (*end != '\0' || end == optarg)
+ if (string_to_number(optarg, 0, 0xfffff, &markinfo->mark))
exit_error(PARAMETER_PROBLEM, "Bad MARK value `%s'", optarg);
if (*flags)
exit_error(PARAMETER_PROBLEM,