system/iptables: avoid trap when running "iptables -L"

masc2008 · linguini1 · commit 7daac30cb47d · 2026-01-11T15:07:15.000-05:00
A trap occurs every time CONFIG_NET_NAT is enabled while CONFIG_NET_IPFILTER is not.

Signed-off-by: Jerry Ma &lt;masc2008@gmail.com&gt;
diff --git a/system/iptables/iptables.c b/system/iptables/iptables.c
@@ -506,7 +506,7 @@ int main(int argc, FAR char *argv[])
   else
 #endif
 #ifdef CONFIG_NET_NAT
-  if (strcmp(args.table, TABLE_NAME_NAT) == 0)
+  if (args.table != NULL && strcmp(args.table, TABLE_NAME_NAT) == 0)
     {
       ret = iptables_apply(&args, iptables_nat_command);
       if (ret < 0)

Original file line number	Diff line number	Diff line change
`@@ -506,7 +506,7 @@ int main(int argc, FAR char *argv[])`
`506`	`506`	`else`
`507`	`507`	`#endif`
`508`	`508`	`#ifdef CONFIG_NET_NAT`
`509`		`- if (strcmp(args.table, TABLE_NAME_NAT) == 0)`
	`509`	`+ if (args.table != NULL && strcmp(args.table, TABLE_NAME_NAT) == 0)`
`510`	`510`	`{`
`511`	`511`	`ret = iptables_apply(&args, iptables_nat_command);`
`512`	`512`	`if (ret < 0)`