Bugfix: Allocate 32 bytes for xcb_send_event, it always copies 32 bytes

Fixes an 'uninitialized memory' error in valgrind

diff --git a/src/xcb.c b/src/xcb.c
index b88b7673346c5c863e5cdf62c6a9a92b40c798f9..115fafe9c916d2ab27eba9dd2518c5d801eac13b 100644 (file)
--- a/src/xcb.c
+++ b/src/xcb.c
@@ -167,23 +167,29 @@ void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext
  *
  */
 void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) {
-    xcb_configure_notify_event_t generated_event;
+    /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes.
+     * In order to properly initialize these bytes, we allocate 32 bytes even
+     * though we only need less for an xcb_configure_notify_event_t */
+    void *event = scalloc(32);
+    xcb_configure_notify_event_t *generated_event = event;
 
-    generated_event.event = window;
-    generated_event.window = window;
-    generated_event.response_type = XCB_CONFIGURE_NOTIFY;
+    generated_event->event = window;
+    generated_event->window = window;
+    generated_event->response_type = XCB_CONFIGURE_NOTIFY;
 
-    generated_event.x = r.x;
-    generated_event.y = r.y;
-    generated_event.width = r.width;
-    generated_event.height = r.height;
+    generated_event->x = r.x;
+    generated_event->y = r.y;
+    generated_event->width = r.width;
+    generated_event->height = r.height;
 
-    generated_event.border_width = 0;
-    generated_event.above_sibling = XCB_NONE;
-    generated_event.override_redirect = false;
+    generated_event->border_width = 0;
+    generated_event->above_sibling = XCB_NONE;
+    generated_event->override_redirect = false;
 
     xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)&generated_event);
     xcb_flush(conn);
+
+    free(event);
 }
 
 /*