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, 16 insertions, 0 deletions

diff --git a/mysys/my_alloc.c b/mysys/my_alloc.c
index 2607ea57d08..dd27dcda41e 100644
--- a/mysys/my_alloc.c
+++ b/mysys/my_alloc.c
@@ -154,6 +154,14 @@ void *alloc_root(MEM_ROOT *mem_root, size_t length)
 
   DBUG_ASSERT(alloc_root_inited(mem_root));
 
+  DBUG_EXECUTE_IF("simulate_out_of_memory",
+                  {
+                    if (mem_root->error_handler)
+                      (*mem_root->error_handler)();
+                    DBUG_SET("-d,simulate_out_of_memory");
+                    DBUG_RETURN((void*) 0); /* purecov: inspected */
+                  });
+
   length+=ALIGN_SIZE(sizeof(USED_MEM));
   if (!(next = (USED_MEM*) my_malloc(length,MYF(MY_WME))))
   {
@@ -176,6 +184,14 @@ void *alloc_root(MEM_ROOT *mem_root, size_t length)
   DBUG_PRINT("enter",("root: 0x%lx", (long) mem_root));
   DBUG_ASSERT(alloc_root_inited(mem_root));
 
+  DBUG_EXECUTE_IF("simulate_out_of_memory",
+                  {
+                    /* Avoid reusing an already allocated block */
+                    if (mem_root->error_handler)
+                      (*mem_root->error_handler)();
+                    DBUG_SET("-d,simulate_out_of_memory");
+                    DBUG_RETURN((void*) 0); /* purecov: inspected */
+                  });
   length= ALIGN_SIZE(length);
   if ((*(prev= &mem_root->free)) != NULL)
   {