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, 7 insertions, 0 deletions

diff --git a/mysys/safemalloc.c b/mysys/safemalloc.c
index c484f1d4c54..938ecd9dde8 100644
--- a/mysys/safemalloc.c
+++ b/mysys/safemalloc.c
@@ -139,6 +139,11 @@ void *_mymalloc(size_t size, const char *filename, uint lineno, myf MyFlags)
 				     size +	/* size requested */
 				     4 +	/* overrun mark */
 				     sf_malloc_endhunc);
+    DBUG_EXECUTE_IF("simulate_out_of_memory",
+                    {
+                      free(irem);
+                      irem= NULL;
+                    });
   }
   /* Check if there isn't anymore memory avaiable */
   if (!irem)
@@ -159,6 +164,8 @@ void *_mymalloc(size_t size, const char *filename, uint lineno, myf MyFlags)
     }
     DBUG_PRINT("error",("Out of memory, in use: %ld at line %d, '%s'",
 			sf_malloc_max_memory,lineno, filename));
+    DBUG_EXECUTE_IF("simulate_out_of_memory",
+                    DBUG_SET("-d,simulate_out_of_memory"););
     if (MyFlags & MY_FAE)
       exit(1);
     DBUG_RETURN ((void*) 0);