From: Eli Zaretskii <eliz@gnu.org>
Date: Mon, 8 Jun 2015 14:39:35 +0000 (+0300)
Subject: Avoid crashes when key-binding is called from a timer
X-Git-Tag: emacs-25.0.90~1825
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=296dadb14e19926de1fc5e0015cb8d4f10f9547a;p=emacs.git

Avoid crashes when key-binding is called from a timer

* src/keymap.c (Fkey_binding): Don't segfault if called with an
empty vector as KEY.  (Bug#20705)
---

diff --git a/src/keymap.c b/src/keymap.c
index 8f4ac0dd437..b69b409fc2d 100644
--- a/src/keymap.c
+++ b/src/keymap.c
@@ -1652,10 +1652,14 @@ specified buffer position instead of point are used.
 
   if (NILP (position) && VECTORP (key))
     {
-      Lisp_Object event
-	/* mouse events may have a symbolic prefix indicating the
-	   scrollbar or mode line */
-	= AREF (key, SYMBOLP (AREF (key, 0)) && ASIZE (key) > 1 ? 1 : 0);
+      Lisp_Object event;
+
+      if (ASIZE (key) == 0)
+	return Qnil;
+
+      /* mouse events may have a symbolic prefix indicating the
+	 scrollbar or mode line */
+      event = AREF (key, SYMBOLP (AREF (key, 0)) && ASIZE (key) > 1 ? 1 : 0);
 
       /* We are not interested in locations without event data */