Truncate wm_name utf8 strings to first zero byte

Fixes #3515

diff --git a/src/window.c b/src/window.c
index 68c6933a4c2eb4c51a7c2d91b42d0c89f38340d4..6128255686942f80b74f491a22fb296ef1d47da6 100644 (file)
--- a/src/window.c
+++ b/src/window.c
@@ -74,8 +74,12 @@ void window_update_name(i3Window *win, xcb_get_property_reply_t *prop, bool befo
     }
 
     i3string_free(win->name);
-    win->name = i3string_from_utf8_with_length(xcb_get_property_value(prop),
-                                               xcb_get_property_value_length(prop));
+
+    /* Truncate the name at the first zero byte. See #3515. */
+    const int len = xcb_get_property_value_length(prop);
+    char *name = sstrndup(xcb_get_property_value(prop), len);
+    win->name = i3string_from_utf8(name);
+    free(name);
 
     Con *con = con_by_window_id(win->id);
     if (con != NULL && con->title_format != NULL) {
@@ -119,8 +123,10 @@ void window_update_name_legacy(i3Window *win, xcb_get_property_reply_t *prop, bo
     }
 
     i3string_free(win->name);
-    win->name = i3string_from_utf8_with_length(xcb_get_property_value(prop),
-                                               xcb_get_property_value_length(prop));
+    const int len = xcb_get_property_value_length(prop);
+    char *name = sstrndup(xcb_get_property_value(prop), len);
+    win->name = i3string_from_utf8(name);
+    free(name);
 
     Con *con = con_by_window_id(win->id);
     if (con != NULL && con->title_format != NULL) {