Index: source/third_party/mongoose/mongoose.cpp
===================================================================
--- source/third_party/mongoose/mongoose.cpp
+++ source/third_party/mongoose/mongoose.cpp
@@ -2454,16 +2454,18 @@
 
 static void dir_scan_callback(struct de *de, void *data) {
   struct dir_scan_data *dsd = (struct dir_scan_data *) data;
+  struct de *reallocated_memory = nullptr;
 
   if (dsd->entries == NULL || dsd->num_entries >= dsd->arr_size) {
     dsd->arr_size *= 2;
-    dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
-                                         sizeof(dsd->entries[0]));
+    struct de *reallocated_memory = (struct de *) realloc(dsd->entries, dsd->arr_size * sizeof(dsd->entries[0]));
   }
-  if (dsd->entries == NULL) {
+  if (NULL == reallocated_memory) {
     // TODO(lsm): propagate an error to the caller
     dsd->num_entries = 0;
   } else {
+    dsd->entries = (struct de *) realloc(dsd->entries, dsd->arr_size *
+                                         sizeof(dsd->entries[0]));
     dsd->entries[dsd->num_entries].file_name = mg_strdup(de->file_name);
     dsd->entries[dsd->num_entries].st = de->st;
     dsd->entries[dsd->num_entries].conn = de->conn;