master 6ed1994d27: Prevent crashes from illegal locale coding systems

[Po Lu]

branch: master
commit 6ed1994d277541035a507481aede6892bb55018c
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Prevent crashes from illegal locale coding systems
    
    * src/xfns.c (xic_preedit_draw_callback):
    * src/xterm.c (handle_one_xevent): Don't pass invalid coding
    systems to `setup_coding_system'.
---
 src/xfns.c  |  8 ++++++++
 src/xterm.c | 10 ++++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/xfns.c b/src/xfns.c
index 02994e1b94..c490dc1802 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -3198,6 +3198,14 @@ xic_preedit_draw_callback (XIC xic, XPointer client_data,
       if (!output->preedit_active)
        return;
 
+      /* If we don't bail out here then GTK can crash
+        from the resulting signal in `setup_coding_system'.  */
+      if (NILP (Fcoding_system_p (Vlocale_coding_system)))
+       {
+         text = NULL;
+         goto im_abort;
+       }
+
       if (call_data->text)
        text = x_xim_text_to_utf8_unix (call_data->text, &text_length);
       else
diff --git a/src/xterm.c b/src/xterm.c
index 50b7c9a606..fe213b0fab 100644
--- a/src/xterm.c
+++ b/src/xterm.c
@@ -10024,6 +10024,11 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 
            if (nchars < nbytes)
              {
+               /* If we don't bail out here then GTK can crash
+                  from the resulting signal in `setup_coding_system'.  */
+               if (NILP (Fcoding_system_p (coding_system)))
+                 goto done_keysym;
+
                /* Decode the input data.  */
 
                /* The input should be decoded with `coding_system'
@@ -11763,6 +11768,11 @@ handle_one_xevent (struct x_display_info *dpyinfo,
 
                  if (nchars < nbytes)
                    {
+                     /* If we don't bail out here then GTK can crash
+                        from the resulting signal in `setup_coding_system'.  */
+                     if (NILP (Fcoding_system_p (Vlocale_coding_system)))
+                       goto xi_done_keysym;
+
                      /* Decode the input data.  */
 
                      setup_coding_system (Vlocale_coding_system, &coding);