bugfix (#976)

libs/api/ebpf_api.cpp

@@ -220,7 +220,10 @@ ebpf_map_create(
         map_definition.value_size = value_size;
         map_definition.max_entries = max_entries;
 
-        inner_map_handle = (opts) ? _get_handle_from_file_descriptor(opts->inner_map_fd) : ebpf_handle_invalid;
+        // bpf_map_create_opts has inner_map_fd defined as __u32, so it cannot be set to
+        // ebpf_fd_invalid (-1). Hence treat inner_map_fd = 0 as ebpf_fd_invalid.
+        inner_map_handle = (opts && opts->inner_map_fd != 0) ? _get_handle_from_file_descriptor(opts->inner_map_fd)
+                                                             : ebpf_handle_invalid;
 
         result = _create_map(map_name, &map_definition, inner_map_handle, &map_handle);
         if (result != EBPF_SUCCESS) {

libs/execution_context/ebpf_maps.c

@@ -262,10 +262,9 @@ _create_array_map(
     ebpf_handle_t inner_map_handle,
     _Outptr_ ebpf_core_map_t** map)
 {
-
-    // Temporarily removing check for inner map handle until
-    // https://github.com/microsoft/ebpf-for-windows/issues/739 is fixed.
-    UNREFERENCED_PARAMETER(inner_map_handle);
+    if (inner_map_handle != ebpf_handle_invalid) {
+        return EBPF_INVALID_ARGUMENT;
+    }
     return _create_array_map_with_map_struct_size(sizeof(ebpf_core_map_t), map_definition, map);
 }