1 files changed, 6 insertions, 6 deletions

diff --git a/Xi/exevents.c b/Xi/exevents.c
index dcd4efb3b..54ea11a93 100644
--- a/Xi/exevents.c
+++ b/Xi/exevents.c
@@ -611,13 +611,13 @@ DeepCopyPointerClasses(DeviceIntPtr from, DeviceIntPtr to)
         }
 
         if (from->button->xkb_acts) {
-            if (!to->button->xkb_acts) {
-                to->button->xkb_acts = calloc(1, sizeof(XkbAction));
-                if (!to->button->xkb_acts)
-                    FatalError("[Xi] not enough memory for xkb_acts.\n");
-            }
+            size_t maxbuttons = max(to->button->numButtons, from->button->numButtons);
+            to->button->xkb_acts = xnfreallocarray(to->button->xkb_acts,
+                                                   maxbuttons,
+                                                   sizeof(XkbAction));
+            memset(to->button->xkb_acts, 0, maxbuttons * sizeof(XkbAction));
             memcpy(to->button->xkb_acts, from->button->xkb_acts,
-                   sizeof(XkbAction));
+                   from->button->numButtons * sizeof(XkbAction));
         }
         else {
             free(to->button->xkb_acts);