Merge pull request #7683 from xcat2/backport-7617-to-2.18

[Backport 2.18] fix(dhcp): avoid infinite loop building IPv6 reverse zones
2026-08-03 16:06:59 +00:00 · 2026-07-24 15:26:29 +00:00
parent ce8a11eb6d 02557a42b3
commit 8bcc00024a
1 changed files with 7 additions and 1 deletions
@@ -3620,7 +3620,13 @@ sub getzonesfornet {
            $rev .= $_ . ".";
            $nibbs--;
        }
-        while ($nibbs) {
+        if ($nibbs < 0) {
+            # a sub-nibble (not 4-bit-aligned) IPv6 mask leaves $nibbs negative;
+            # bail rather than spin forever in the loop below. $nibbs == 0 is the
+            # normal nibble-aligned case (e.g. a /64) and must still emit a zone.
+            return ();
+        }
+        while ($nibbs > 0) {
            $rev .= "0.";
            $nibbs--;
        }