BUG#13979418: SHOW BINLOG EVENTS MAY CRASH THE SERVER

Merge from 5.1 into 5.5.

Conflicts:
 * sql/log.h
 * sql/sql_repl.cc

mysql-test/suite/rpl/r/rpl_parallel_show_binlog_events_purge_logs.result

+include/master-slave.inc
+[connection master]
+[connection slave]
+SET DEBUG_SYNC= 'after_show_binlog_events SIGNAL on_show_binlog_events WAIT_FOR end';
+SHOW BINLOG EVENTS;
+[connection slave1]
+SET DEBUG_SYNC= 'now WAIT_FOR on_show_binlog_events';
+FLUSH LOGS;
+SET DEBUG_SYNC= 'now SIGNAL end';
+SET DEBUG_SYNC= 'RESET';
+[connection slave]
+SET DEBUG_SYNC= 'RESET';
+include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_parallel_show_binlog_events_purge_logs.test

+# BUG#13979418: SHOW BINLOG EVENTS MAY CRASH THE SERVER
+#
+# The function mysql_show_binlog_events has a local stack variable
+# 'LOG_INFO linfo;', which is assigned to thd->current_linfo, however
+# this variable goes out of scope and is destroyed before clean
+# thd->current_linfo.
+#
+# This test case runs SHOW BINLOG EVENTS and FLUSH LOGS to make sure
+# that with the fix local variable linfo is valid along all
+# mysql_show_binlog_events function scope.
+#
+--source include/have_debug_sync.inc
+--source include/master-slave.inc
+
+--echo [connection slave]
+--connection slave
+SET DEBUG_SYNC= 'after_show_binlog_events SIGNAL on_show_binlog_events WAIT_FOR end';
+--send SHOW BINLOG EVENTS
+
+--connection slave1
+--echo [connection slave1]
+SET DEBUG_SYNC= 'now WAIT_FOR on_show_binlog_events';
+FLUSH LOGS;
+SET DEBUG_SYNC= 'now SIGNAL end';
+SET DEBUG_SYNC= 'RESET';
+
+--echo [connection slave]
+--connection slave
+--disable_result_log
+--reap
+--enable_result_log
+SET DEBUG_SYNC= 'RESET';
+
+--connection master
+--source include/rpl_end.inc

sql/log.h

@@ -151,6 +151,11 @@ class Relay_log_info;
 extern PSI_mutex_key key_LOG_INFO_lock;
 #endif
 
+/*
+  Note that we destroy the lock mutex in the desctructor here.
+  This means that object instances cannot be destroyed/go out of scope,
+  until we have reset thd->current_linfo to NULL;
+ */
 typedef struct st_log_info
 {
   char log_file_name[FN_REFLEN];

sql/sql_repl.cc

@@ -1737,6 +1737,8 @@ bool mysql_show_binlog_events(THD* thd)
   File file = -1;
   MYSQL_BIN_LOG *binary_log= NULL;
   int old_max_allowed_packet= thd->variables.max_allowed_packet;
+  LOG_INFO linfo;
+
   DBUG_ENTER("mysql_show_binlog_events");
 
   Log_event::init_show_field_list(&field_list);
@@ -1779,7 +1781,6 @@ bool mysql_show_binlog_events(THD* thd)
     char search_file_name[FN_REFLEN], *name;
     const char *log_file_name = lex_mi->log_file_name;
     mysql_mutex_t *log_lock = binary_log->get_log_lock();
-    LOG_INFO linfo;
     Log_event* ev;
 
     unit->set_limit(thd->lex->current_select);
@@ -1871,6 +1872,8 @@ bool mysql_show_binlog_events(THD* thd)
 
     mysql_mutex_unlock(log_lock);
   }
+  // Check that linfo is still on the function scope.
+  DEBUG_SYNC(thd, "after_show_binlog_events");
 
   ret= FALSE;