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-rw-r--r--extensions/libipt_MASQUERADE.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extensions/libipt_MASQUERADE.c b/extensions/libipt_MASQUERADE.c
index 2d4ee99d..c30e2faf 100644
--- a/extensions/libipt_MASQUERADE.c
+++ b/extensions/libipt_MASQUERADE.c
@@ -47,7 +47,7 @@ parse_ports(const char *arg, struct ip_nat_multi_range *mr)
mr->range[0].flags |= IP_NAT_RANGE_PROTO_SPECIFIED;
port = atoi(arg);
- if (port == 0 || port > 65535)
+ if (port <= 0 || port > 65535)
exit_error(PARAMETER_PROBLEM, "Port `%s' not valid\n", arg);
dash = strchr(arg, '-');