MDEV-33478: Tests massively fail with clang-18 -fsanitize=memory

Starting with clang-16, MemorySanitizer appears to check that
uninitialized values not be passed by value nor returned.
Previously, it was allowed to copy uninitialized data in such cases.

get_foreign_key_info(): Remove a local variable that was passed
uninitialized to a function.

DsMrr_impl: Initialize key_buffer, because DsMrr_impl::dsmrr_init()
is reading it.

test_bind_result_ext1(): MYSQL_TYPE_LONG is 32 bits, hence we must
use a 32-bit type, such as int. sizeof(long) differs between
LP64 and LLP64 targets.

sql/debug_sync.cc

@@ -1008,7 +1008,7 @@ static bool debug_sync_eval_action(THD *thd, char *action_str, char *action_end)
   st_debug_sync_action  *action= NULL;
   const char            *errmsg;
   char                  *ptr;
-  char                  *token;
+  char                  *token= nullptr;
   uint                  token_length= 0;
   DBUG_ENTER("debug_sync_eval_action");
   DBUG_ASSERT(thd);

sql/item_func.h

@@ -90,7 +90,7 @@ public:
   static void wrong_param_count_error(const LEX_CSTRING &schema_name,
                                       const LEX_CSTRING &func_name);
 
-  table_map not_null_tables_cache;
+  table_map not_null_tables_cache= 0;
 
   enum Functype { UNKNOWN_FUNC,EQ_FUNC,EQUAL_FUNC,NE_FUNC,LT_FUNC,LE_FUNC,
 		  GE_FUNC,GT_FUNC,FT_FUNC,

sql/log.h

@@ -426,6 +426,7 @@ struct wait_for_commit;
 
 class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG
 {
+#ifdef HAVE_PSI_INTERFACE
   /** The instrumentation key to use for @ LOCK_index. */
   PSI_mutex_key m_key_LOCK_index;
   /** The instrumentation key to use for @ COND_relay_log_updated */
@@ -440,6 +441,16 @@ class MYSQL_BIN_LOG: public TC_LOG, private MYSQL_LOG
   PSI_cond_key m_key_COND_queue_busy;
   /** The instrumentation key to use for LOCK_binlog_end_pos. */
   PSI_mutex_key m_key_LOCK_binlog_end_pos;
+#else
+  static constexpr PSI_mutex_key m_key_LOCK_index= 0;
+  static constexpr PSI_cond_key m_key_relay_log_update= 0;
+  static constexpr PSI_cond_key m_key_bin_log_update= 0;
+  static constexpr PSI_file_key m_key_file_log= 0, m_key_file_log_cache= 0;
+  static constexpr PSI_file_key m_key_file_log_index= 0;
+  static constexpr PSI_file_key m_key_file_log_index_cache= 0;
+  static constexpr PSI_cond_key m_key_COND_queue_busy= 0;
+  static constexpr PSI_mutex_key m_key_LOCK_binlog_end_pos= 0;
+#endif
 
   struct group_commit_entry
   {

sql/multi_range_read.h

@@ -556,10 +556,6 @@ class DsMrr_impl
 public:
   typedef void (handler::*range_check_toggle_func_t)(bool on);
 
-  DsMrr_impl()
-    : secondary_file(NULL),
-      rowid_filter(NULL) {};
-  
   void init(handler *h_arg, TABLE *table_arg)
   {
     primary_file= h_arg; 
@@ -581,7 +577,7 @@ public:
   int dsmrr_explain_info(uint mrr_mode, char *str, size_t size);
 private:
   /* Buffer to store (key, range_id) pairs */
-  Lifo_buffer *key_buffer;
+  Lifo_buffer *key_buffer= nullptr;
 
   /*
     The "owner" handler object (the one that is expected to "own" this object
@@ -594,13 +590,13 @@ private:
     Secondary handler object. (created when needed, we need it when we need 
     to run both index scan and rnd_pos() scan at the same time)
   */
-  handler *secondary_file;
+  handler *secondary_file= nullptr;
 
   /*
     The rowid filter that DS-MRR has "unpushed" from the storage engine.
     If it's present, DS-MRR will use it.
   */
-  Rowid_filter *rowid_filter;
+  Rowid_filter *rowid_filter= nullptr;
 
   uint keyno; /* index we're running the scan on */
   /* TRUE <=> need range association, buffers hold {rowid, range_id} pairs */

sql/sql_lex.h

@@ -3260,7 +3260,7 @@ public:
   Table_type table_type;                        /* Used for SHOW CREATE */
   List<Key_part_spec> ref_list;
   List<LEX_USER>      users_list;
-  List<Item>          *insert_list,field_list,value_list,update_list;
+  List<Item>          *insert_list= nullptr,field_list,value_list,update_list;
   List<List_item>     many_values;
   List<set_var_base>  var_list;
   List<set_var_base>  stmt_var_list; //SET_STATEMENT values

storage/innobase/handler/ha_innodb.cc

@@ -12108,7 +12108,7 @@ create_table_info_t::create_foreign_keys()
 	dict_index_t*	      index	  = NULL;
 	fkerr_t		      index_error = FK_SUCCESS;
 	dict_index_t*	      err_index	  = NULL;
-	ulint		      err_col;
+	ulint		      err_col	= 0;
 	const bool	      tmp_table = m_flags2 & DICT_TF2_TEMPORARY;
 	const CHARSET_INFO*   cs	= thd_charset(m_thd);
 	const char*	      operation = "Create ";
@@ -15150,7 +15150,6 @@ get_foreign_key_info(
 	char			tmp_buff[NAME_LEN+1];
 	char			name_buff[NAME_LEN+1];
 	const char*		ptr;
-	LEX_CSTRING*		referenced_key_name;
 	LEX_CSTRING*		name = NULL;
 
 	if (dict_table_t::is_temporary_name(foreign->foreign_table_name)) {
@@ -15255,18 +15254,16 @@ get_foreign_key_info(
 
 	if (foreign->referenced_index
 	    && foreign->referenced_index->name != NULL) {
-		referenced_key_name = thd_make_lex_string(
+		f_key_info.referenced_key_name = thd_make_lex_string(
 			thd,
-			f_key_info.referenced_key_name,
+			nullptr,
 			foreign->referenced_index->name,
 			strlen(foreign->referenced_index->name),
 			1);
 	} else {
-		referenced_key_name = NULL;
+		f_key_info.referenced_key_name = NULL;
 	}
 
-	f_key_info.referenced_key_name = referenced_key_name;
-
 	pf_key_info = (FOREIGN_KEY_INFO*) thd_memdup(thd, &f_key_info,
 						      sizeof(FOREIGN_KEY_INFO));
 

storage/myisam/ft_boolean_search.c

@@ -287,6 +287,8 @@ static int ftb_parse_query_internal(MYSQL_FTPARSER_PARAM *param,
   uchar *end= (uchar*) query + len;
   FT_WORD w;
 
+  w.pos= NULL;
+  w.len= 0;
   info.prev= ' ';
   info.quot= 0;
   while (ft_get_word(cs, start, end, &w, &info))

tests/mysql_client_test.c

@@ -3842,7 +3842,7 @@ static void test_bind_result_ext1()
   short      i_data;
   uchar      b_data;
   int        f_data;
-  long       bData;
+  int        bData;
   char       d_data[20];
   double     szData;
   MYSQL_BIND my_bind[8];
@@ -3938,7 +3938,7 @@ static void test_bind_result_ext1()
     fprintf(stdout, "\n data (float)  : %d(%lu)", f_data, length[4]);
     fprintf(stdout, "\n data (double) : %s(%lu)", d_data, length[5]);
 
-    fprintf(stdout, "\n data (bin)    : %ld(%lu)", bData, length[6]);
+    fprintf(stdout, "\n data (bin)    : %d(%lu)", bData, length[6]);
     fprintf(stdout, "\n data (str)    : %g(%lu)", szData, length[7]);
   }