Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

into  magare.gmz:/home/kgeorge/mysql/autopush/B26281-5.0-opt

mysql-test/r/func_str.result

@@ -1960,4 +1960,16 @@ NULL
 SELECT UNHEX('G') IS NULL;
 UNHEX('G') IS NULL
 1
+SELECT INSERT('abc', 3, 3, '1234');
+INSERT('abc', 3, 3, '1234')
+ab1234
+SELECT INSERT('abc', 4, 3, '1234');
+INSERT('abc', 4, 3, '1234')
+abc1234
+SELECT INSERT('abc', 5, 3, '1234');
+INSERT('abc', 5, 3, '1234')
+abc
+SELECT INSERT('abc', 6, 3, '1234');
+INSERT('abc', 6, 3, '1234')
+abc
 End of 5.0 tests

mysql-test/t/func_str.test

@@ -1008,7 +1008,6 @@ select repeat('a', cast(2 as unsigned int));
 select rpad('abc', cast(5 as unsigned integer), 'x');
 select lpad('abc', cast(5 as unsigned integer), 'x');
 
-
 #
 # Bug #25197 :repeat function returns null when using table field directly as count
 #
@@ -1036,4 +1035,12 @@ DROP TABLE t1;
 SELECT UNHEX('G');
 SELECT UNHEX('G') IS NULL;
 
+#
+# Bug #26281: INSERT() function mishandles NUL on boundary condition
+#
+SELECT INSERT('abc', 3, 3, '1234');
+SELECT INSERT('abc', 4, 3, '1234');
+SELECT INSERT('abc', 5, 3, '1234');
+SELECT INSERT('abc', 6, 3, '1234');
+
 --echo End of 5.0 tests

sql/item_strfunc.cc

@@ -967,18 +967,18 @@ String *Item_func_insert::val_str(String *str)
       args[3]->null_value)
     goto null; /* purecov: inspected */
 
-  if ((start < 0) || (start > res->length() + 1))
+  if ((start < 0) || (start > res->length()))
     return res;                                 // Wrong param; skip insert
-  if ((length < 0) || (length > res->length() + 1))
-    length= res->length() + 1;
+  if ((length < 0) || (length > res->length()))
+    length= res->length();
 
   /* start and length are now sufficiently valid to pass to charpos function */
   start= res->charpos((int) start);
   length= res->charpos((int) length, (uint32) start);
 
   /* Re-testing with corrected params */
-  if (start > res->length() + 1)
-    return res;                                 // Wrong param; skip insert
+  if (start > res->length())
+    return res; /* purecov: inspected */        // Wrong param; skip insert
   if (length > res->length() - start)
     length= res->length() - start;