Merge pull request #7617 from VersatusHPC/harvest/dhcp-ipv6-infinite-loop

fix(dhcp): avoid infinite loop building IPv6 reverse zones
2026-09-22 00:49:30 +00:00 · 2026-07-24 12:08:24 -03:00
parent 0d97006e1d f0a879491d
commit 1424188693
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--;
        }