Fix for 177208 - unmark arena when DER decoding is successful

security/nss/lib/util/quickder.c

@@ -898,6 +898,10 @@ SECStatus SEC_QuickDERDecodeItem(PRArenaPool* arena, void* dest,
         {
             PORT_ArenaRelease(arena, savpos);
         }
+        else
+        {
+            PORT_ArenaUnmark(arena, savpos);
+        }
     }
 
     return rv;