bk commit into 5.0 tree (gkodinov:1.2435) BUG#26281

[kgeorge]

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5.0 repository of kgeorge. When kgeorge does a push these changes will
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ChangeSet@stripped, 2007-03-09 12:47:12+02:00, gkodinov@stripped +3 -0
  Bug #26281:
   Fixed boundry checks in the INSERT() function:
   were one off.

  mysql-test/r/func_str.result@stripped, 2007-03-09 12:47:11+02:00, gkodinov@stripped +12
-0
    Bug #26281: test case

  mysql-test/t/func_str.test@stripped, 2007-03-09 12:47:11+02:00, gkodinov@stripped +8 -0
    Bug #26281: test case

  sql/item_strfunc.cc@stripped, 2007-03-09 12:47:11+02:00, gkodinov@stripped +5 -5
    Bug #26281: fixed boundry checks

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	gkodinov
# Host:	magare.gmz
# Root:	/home/kgeorge/mysql/work/B26281-5.0-opt

--- 1.295/sql/item_strfunc.cc	2007-02-21 13:05:00 +02:00
+++ 1.296/sql/item_strfunc.cc	2007-03-09 12:47:11 +02:00
@@ -967,18 +967,18 @@ String *Item_func_insert::val_str(String
       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;
 

--- 1.127/mysql-test/r/func_str.result	2007-03-02 12:14:49 +02:00
+++ 1.128/mysql-test/r/func_str.result	2007-03-09 12:47:11 +02:00
@@ -1946,4 +1946,16 @@ 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

--- 1.100/mysql-test/t/func_str.test	2007-03-02 12:14:49 +02:00
+++ 1.101/mysql-test/t/func_str.test	2007-03-09 12:47:11 +02:00
@@ -1014,4 +1014,12 @@ select lpad('abc', cast(5 as unsigned in
 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