extensions: ecn: Sanitize xlate callback

Catch unexpected values in einfo->ip_ect.

Fixes: ca42442093d3d ("iptables: extensions: libxt_ecn: Add translation to nft")
Signed-off-by: Phil Sutter <phil@nwl.cc>

diff --git a/extensions/libxt_ecn.c b/extensions/libxt_ecn.c
index ad3c7a0307a0d864a8314ffa2f15b25cd15987fd..83a4acfab7da76bd4018c9ec5a9c6ea13633d5fa 100644 (file)
--- a/extensions/libxt_ecn.c
+++ b/extensions/libxt_ecn.c
@@ -156,6 +156,8 @@ static int ecn_xlate(struct xt_xlate *xl,
                case 3:
                        xt_xlate_add(xl, "ce");
                        break;
+               default:
+                       return 0;
                }
        }
        return 1;