From: Paul Eggert <eggert@cs.ucla.edu>
Date: Sun, 27 Mar 2011 08:21:49 +0000 (-0700)
Subject: * syntax.c (scan_sexps_forward): Avoid pointer wraparound.
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* syntax.c (scan_sexps_forward): Avoid pointer wraparound.
---

diff --git a/src/ChangeLog b/src/ChangeLog
index 65c61943f69..75359543111 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,7 @@
 2011-03-27  Paul Eggert  <eggert@cs.ucla.edu>
 
+	* syntax.c (scan_sexps_forward): Avoid pointer wraparound.
+
 	* xterm.c (x_make_frame_visible, same_x_server): Redo to avoid overflow
 	concerns.
 
diff --git a/src/syntax.c b/src/syntax.c
index c1442c396c1..0a1525b54ea 100644
--- a/src/syntax.c
+++ b/src/syntax.c
@@ -3265,9 +3265,9 @@ do { prev_from = from;				\
     = (curlevel == levelstart) ? -1 : (curlevel - 1)->last;
   state.location = from;
   state.levelstarts = Qnil;
-  while (--curlevel >= levelstart)
-      state.levelstarts = Fcons (make_number (curlevel->last),
-				 state.levelstarts);
+  while (curlevel > levelstart)
+    state.levelstarts = Fcons (make_number ((--curlevel)->last),
+			       state.levelstarts);
   immediate_quit = 0;
 
   *stateptr = state;