Reject invalid coin height and output index when loading assumeutxo

src/validation.cpp

@@ -4989,6 +4989,14 @@ bool ChainstateManager::PopulateAndValidateSnapshot(
                       coins_count - coins_left);
             return false;
         }
+        if (coin.nHeight > base_height ||
+            outpoint.n >= std::numeric_limits<decltype(outpoint.n)>::max() // Avoid integer wrap-around in coinstats.cpp:ApplyHash
+        ) {
+            LogPrintf("[snapshot] bad snapshot data after deserializing %d coins\n",
+                      coins_count - coins_left);
+            return false;
+        }
+
         coins_cache.EmplaceCoinInternalDANGER(std::move(outpoint), std::move(coin));
 
         --coins_left;