[iptables PATCH v2 01/11] ebtables: Fix error message for invalid parameters

[Phil Sutter]

With empty ruleset, ebtables-nft would report the wrong argv:

| % sudo ./install/sbin/ebtables-nft -vnL
| ebtables v1.8.3 (nf_tables): Unknown argument: './install/sbin/ebtables-nft'
| Try `ebtables -h' or 'ebtables --help' for more information.

After a (successful) call to 'ebtables-nft -L', this would even
segfault:

| % sudo ./install/sbin/ebtables-nft -vnL
| zsh: segmentation fault  sudo ./install/sbin/ebtables-nft -vnL

Fixes: acde6be32036f ("ebtables-translate: Fix segfault while parsing extension 
options")
Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 iptables/xtables-eb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/iptables/xtables-eb.c b/iptables/xtables-eb.c
index 171f41b0f616e..b8d89ad974a42 100644
--- a/iptables/xtables-eb.c
+++ b/iptables/xtables-eb.c
@@ -1180,7 +1180,7 @@ print_zero:
                        if (ebt_command_default(&cs))
                                xtables_error(PARAMETER_PROBLEM,
                                              "Unknown argument: '%s'",
-                                             argv[optind - 1]);
+                                             argv[optind]);
 
                        if (command != 'A' && command != 'I' &&
                            command != 'D' && command != 'C')
-- 
2.22.0