fixed invalid memory reads detected by the address sanitizer

yodl/VERSION

@@ -1,2 +1,2 @@
-#define VERSION "3.06.00"
-#define YEARS   "1996-2015"
+#define VERSION "3.07.00"
+#define YEARS   "1996-2016"

yodl/changelog

@@ -1,3 +1,12 @@
+yodl (3.07.00)
+
+  * Hanno B\"ock reported an invalid memory read found by the address sanitizer
+    (using -fsanitize=address). Fixed in this release. The address santizer
+    also reported some memory leaks which are not nice, but their fix will
+    probably take some more time.
+
+ -- Frank B. Brokken <f.b.brokken@rug.nl>  Thu, 04 Feb 2016 22:35:44 +0100
+
 yodl (3.06.00)
 
   * The title, author, date and affiliation elements in html document headers

yodl/src/queue/queuepush.c

@@ -29,8 +29,11 @@ void queue_push(register Queue *qp, size_t extra_length, char const *info)
 
     if (extra_length > available_length)
     {
+        size_t original_length = memory_length;
+
                                                    /* enlarge the buffer:  */
         memory_length += extra_length - available_length + BLOCK_QUEUE;
+
         cp = new_memory(memory_length, sizeof(char));
 
         if (message_show(MSG_INFO))
@@ -48,7 +51,7 @@ void queue_push(register Queue *qp, size_t extra_length, char const *info)
         }
         else                                        /* q as one block       */
         {
-            memcpy(cp, qp->d_memory, memory_length);/* cp existing buffer   */
+            memcpy(cp, qp->d_memory, original_length);/* cp existing buffer   */
             qp->d_read = cp + (qp->d_read - qp->d_memory);
             qp->d_write = cp + (qp->d_write - qp->d_memory);
         }