Avoid crashes if async input arrives when setting properties for DND

* src/xterm.c (x_dnd_begin_drag_and_drop): Block input around
non-async signal safe functions.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/xterm.c b/src/xterm.c
index 33165c27a76..d271c7190d4 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -7001,6 +7001,7 @@ x_dnd_begin_drag_and_drop (struct frame *f, Time time, Atom xaction,
       prop.format = 8;
       prop.nitems = end;
 
+      block_input ();
       XSetTextProperty (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                         &prop, FRAME_DISPLAY_INFO (f)->Xatom_XdndActionDescription);
       xfree (ask_actions);
@@ -7009,6 +7010,7 @@ x_dnd_begin_drag_and_drop (struct frame *f, Time time, Atom xaction,
                        FRAME_DISPLAY_INFO (f)->Xatom_XdndActionList, XA_ATOM, 32,
                        PropModeReplace, (unsigned char *) ask_action_list,
                        n_ask_actions);
+      unblock_input ();
     }
   else
     {
@@ -7016,10 +7018,12 @@ x_dnd_begin_drag_and_drop (struct frame *f, Time time, Atom xaction,
          and not the action to decide whether or not the user should
          be prompted to select an action.  */
 
+      block_input ();
       XDeleteProperty (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                        FRAME_DISPLAY_INFO (f)->Xatom_XdndActionList);
       XDeleteProperty (FRAME_X_DISPLAY (f), FRAME_X_WINDOW (f),
                        FRAME_DISPLAY_INFO (f)->Xatom_XdndActionDescription);
+      unblock_input ();
     }
 
   x_dnd_in_progress = true;