From f40868de7f338d669ef4e2bf3064f40a4f73ebd8 Mon Sep 17 00:00:00 2001
From: mdw <mdw>
Date: Sat, 3 Apr 2004 03:29:40 +0000
Subject: [PATCH] Fix overrun in @mpx_lsr@.

---
 mpx.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/mpx.c b/mpx.c
index 1591f98..ef93e3e 100644
--- a/mpx.c
+++ b/mpx.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: mpx.c,v 1.18 2004/04/01 12:50:09 mdw Exp $
+ * $Id: mpx.c,v 1.19 2004/04/03 03:29:40 mdw Exp $
  *
  * Low-level multiprecision arithmetic
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: mpx.c,v $
+ * Revision 1.19  2004/04/03 03:29:40  mdw
+ * Fix overrun in @mpx_lsr@.
+ *
  * Revision 1.18  2004/04/01 12:50:09  mdw
  * Add cyclic group abstraction, with test code.  Separate off exponentation
  * functions for better static linking.  Fix a buttload of bugs on the way.
@@ -660,7 +663,7 @@ void mpx_lsr(mpw *dv, mpw *dvl, const mpw *av, const mpw *avl, size_t n)
   /* --- Single bit shifting --- */
 
   else if (n == 1) {
-    mpw w = *av++ >> 1;
+    mpw w = av < avl ? *av++ >> 1 : 0;
     while (av < avl) {
       mpw t;
       if (dv >= dvl)
-- 
2.11.0