Bug #42064: low memory crash when importing hex strings, in

            Item_hex_string::Item_hex_string

The status of memory allocation in the Lex_input_stream (called
from the Parser_state constructor) was not checked which led to
a parser crash in case of the out-of-memory error.

The solution is to introduce new init() member function in
Parser_state and Lex_input_stream so that status of memory
allocation can be returned to the caller.

mysql-test/r/error_simulation.result:
  Added a test case for bug #42064.
mysql-test/t/error_simulation.test:
  Added a test case for bug #42064.
mysys/my_alloc.c:
  Added error injection code for the regression test.
mysys/my_malloc.c:
  Added error injection code for the regression test.
mysys/safemalloc.c:
  Added error injection code for the regression test.
sql/event_data_objects.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/mysqld.cc:
  Added error injection code for the regression test.
sql/sp.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_lex.cc:
  Moved memory allocation from constructor to the separate init()
  member function.
  Added error injection code for the regression test.
sql/sql_lex.h:
  Moved memory allocation from constructor to the separate init()
  member function.
sql/sql_parse.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_partition.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_prepare.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_trigger.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures.
sql/sql_view.cc:
  Use the new init() member function of Parser_state and check
  its return value to handle memory allocation failures..
sql/thr_malloc.cc:
  Added error injection code for the regression test.

1 files changed, 11 insertions, 1 deletions

diff --git a/mysys/my_malloc.c b/mysys/my_malloc.c
index 12793ad451b..13d2375eb99 100644
--- a/mysys/my_malloc.c
+++ b/mysys/my_malloc.c
@@ -31,13 +31,23 @@ void *my_malloc(size_t size, myf my_flags)
 
   if (!size)
     size=1;					/* Safety */
-  if ((point = (char*)malloc(size)) == NULL)
+
+  point= (char *) malloc(size);
+  DBUG_EXECUTE_IF("simulate_out_of_memory",
+                  {
+                    free(point);
+                    point= NULL;
+                  });
+
+  if (point == NULL)
   {
     my_errno=errno;
     if (my_flags & MY_FAE)
       error_handler_hook=fatal_error_handler_hook;
     if (my_flags & (MY_FAE+MY_WME))
       my_error(EE_OUTOFMEMORY, MYF(ME_BELL+ME_WAITTANG+ME_NOREFRESH),size);
+    DBUG_EXECUTE_IF("simulate_out_of_memory",
+                    DBUG_SET("-d,simulate_out_of_memory"););
     if (my_flags & MY_FAE)
       exit(1);
   }