From: Eli Zaretskii <eliz@gnu.org>
Date: Sat, 17 Aug 2024 18:35:08 +0000 (+0300)
Subject: Avoid rare crashes due to clobbering of input events
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=95b387b1d52d13284ece2d33c92b2fd5f8a5f262;p=emacs.git

Avoid rare crashes due to clobbering of input events

* src/keyboard.c (read_char): Declare C 'volatile', to prevent
clobbering it by setjmp/longjmp.  Do not merge to master.
(Bug#71744)

(cherry picked from commit 9e7c2d3816ec3e1247b1bd3cfcafc60a84b0f5ec)
---

diff --git a/src/keyboard.c b/src/keyboard.c
index 909c97774a4..a6bd113f19e 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -2517,7 +2517,7 @@ read_char (int commandflag, Lisp_Object map,
 	   Lisp_Object prev_event,
 	   bool *used_mouse_menu, struct timespec *end_time)
 {
-  Lisp_Object c;
+  volatile Lisp_Object c;
   sys_jmp_buf local_getcjmp;
   sys_jmp_buf save_jump;
   Lisp_Object tem, save;