bk commit into 5.0 tree (ingo:1.1974) BUG#13707

[ingo]

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5.0 repository of mydev. When mydev does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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ChangeSet
  1.1974 05/11/14 19:53:41 ingo@stripped +1 -0
  Bug#13707 - Server crash with INSERT DELAYED on MyISAM table
  After push fix. Must not access new_field if it is NULL.

  sql/field.cc
    1.291 05/11/14 19:53:36 ingo@stripped +12 -9
    Bug#13707 - Server crash with INSERT DELAYED on MyISAM table
    After push fix. Must not access new_field if it is NULL.

# 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:	ingo
# Host:	chilla.local
# Root:	/home/mydev/mysql-5.0-bug13707

--- 1.290/sql/field.cc	2005-11-08 20:18:05 +01:00
+++ 1.291/sql/field.cc	2005-11-14 19:53:36 +01:00
@@ -6194,6 +6194,8 @@
 
 Field *Field_string::new_field(MEM_ROOT *root, struct st_table *new_table)
 {
+  Field *new_field;
+
   if (type() != MYSQL_TYPE_VAR_STRING || table == new_table)
     return Field::new_field(root, new_table);
 
@@ -6202,15 +6204,16 @@
     This is done to ensure that ALTER TABLE will convert old VARCHAR fields
     to now VARCHAR fields.
   */
-  Field *new_field= new Field_varstring(field_length, maybe_null(),
-                                        field_name, new_table,
-                                        charset());
-  /*
-    delayed_insert::get_local_table() needs a ptr copied from old table.
-    This is what other new_field() methods do too. The above method of
-    Field_varstring sets ptr to NULL.
-  */
-  new_field->ptr= ptr;
+  if (new_field= new Field_varstring(field_length, maybe_null(),
+                                     field_name, new_table, charset()))
+  {
+    /*
+      delayed_insert::get_local_table() needs a ptr copied from old table.
+      This is what other new_field() methods do too. The above method of
+      Field_varstring sets ptr to NULL.
+    */
+    new_field->ptr= ptr;
+  }
   return new_field;
 }