Bug#31382

"Disabled plugin is provoking Valgrind error"
  If there are any auto-alloced string plug-in options, memory is
  allocated during the call for handle_options(). We must free this
  memory if we are not installing the plug-in.


include/my_getopt.h:
  bug31382
    new function: my_cleanup_options()
mysys/my_getopt.c:
  bug31382
    new function: my_cleanup_options(), fini_one_value()
    alter init_variables() to take an extra option.
    forward declare init_one_value() and fini_one_value()
sql/sql_plugin.cc:
  bug31382
    after calling handle_options(), make sure to call my_cleanup_options()
    if we are not installing the plug-in.

include/my_getopt.h

@@ -68,6 +68,7 @@ extern my_error_reporter my_getopt_error_reporter;
 
 extern int handle_options (int *argc, char ***argv, 
 			   const struct my_option *longopts, my_get_one_option);
+extern void my_cleanup_options(const struct my_option *options);
 extern void my_print_help(const struct my_option *options);
 extern void my_print_variables(const struct my_option *options);
 extern void my_getopt_register_get_addr(uchar ** (*func_addr)(const char *, uint,

mysys/my_getopt.c

@@ -20,6 +20,9 @@
 #include <mysys_err.h>
 #include <my_getopt.h>
 
+typedef void (*init_func_p)(const struct my_option *option, uchar* *variable,
+                            longlong value);
+
 static void default_reporter(enum loglevel level, const char *format, ...);
 my_error_reporter my_getopt_error_reporter= &default_reporter;
 
@@ -33,7 +36,12 @@ static longlong getopt_ll(char *arg, const struct my_option *optp, int *err);
 static ulonglong getopt_ull(char *arg, const struct my_option *optp,
 			    int *err);
 static double getopt_double(char *arg, const struct my_option *optp, int *err);
-static void init_variables(const struct my_option *options);
+static void init_variables(const struct my_option *options,
+                           init_func_p init_one_value);
+static void init_one_value(const struct my_option *option, uchar* *variable,
+			   longlong value);
+static void fini_one_value(const struct my_option *option, uchar* *variable,
+			   longlong value);
 static int setval(const struct my_option *opts, uchar* *value, char *argument,
 		  my_bool set_maximum_value);
 static char *check_struct_option(char *cur_arg, char *key_name);
@@ -117,7 +125,7 @@ int handle_options(int *argc, char ***argv,
   DBUG_ASSERT(argv && *argv);
   (*argc)--; /* Skip the program name */
   (*argv)++; /*      --- || ----      */
-  init_variables(longopts);
+  init_variables(longopts, init_one_value);
 
   for (pos= *argv, pos_end=pos+ *argc; pos != pos_end ; pos++)
   {
@@ -906,6 +914,37 @@ static void init_one_value(const struct my_option *option, uchar* *variable,
 }
 
 
+/*
+  Init one value to it's default values
+
+  SYNOPSIS
+    init_one_value()
+    option		Option to initialize
+    value		Pointer to variable
+*/
+
+static void fini_one_value(const struct my_option *option, uchar* *variable,
+			   longlong value __attribute__ ((unused)))
+{
+  DBUG_ENTER("fini_one_value");
+  switch ((option->var_type & GET_TYPE_MASK)) {
+  case GET_STR_ALLOC:
+    my_free((*(char**) variable), MYF(MY_ALLOW_ZERO_PTR));
+    *((char**) variable)= NULL;
+    break;
+  default: /* dummy default to avoid compiler warnings */
+    break;
+  }
+  DBUG_VOID_RETURN;
+}
+
+
+void my_cleanup_options(const struct my_option *options)
+{
+  init_variables(options, fini_one_value);
+}
+
+
 /* 
   initialize all variables to their default values
 
@@ -919,7 +958,8 @@ static void init_one_value(const struct my_option *option, uchar* *variable,
     for a value and initialize.
 */
 
-static void init_variables(const struct my_option *options)
+static void init_variables(const struct my_option *options,
+                           init_func_p init_one_value)
 {
   DBUG_ENTER("init_variables");
   for (; options->name; options++)

sql/sql_plugin.cc

@@ -3092,7 +3092,7 @@ static int test_plugin_options(MEM_ROOT *tmp_root, struct st_plugin_int *tmp,
     {
        sql_print_error("Parsing options for plugin '%s' failed.",
                        tmp->name.str);
-       DBUG_RETURN(error);
+       goto err;
     }
   }
 
@@ -3102,6 +3102,8 @@ static int test_plugin_options(MEM_ROOT *tmp_root, struct st_plugin_int *tmp,
     *enabled= TRUE;
   }
 
+  error= 1;
+
   if (*enabled)
   {
     for (opt= tmp->plugin->system_vars; opt && *opt; opt++)
@@ -3140,7 +3142,7 @@ static int test_plugin_options(MEM_ROOT *tmp_root, struct st_plugin_int *tmp,
       {
         sql_print_error("Plugin '%s' has conflicting system variables",
                         tmp->name.str);
-        DBUG_RETURN(1);
+        goto err;
       }
       tmp->system_vars= chain.first;
     }
@@ -3150,7 +3152,9 @@ static int test_plugin_options(MEM_ROOT *tmp_root, struct st_plugin_int *tmp,
   if (enabled_saved && global_system_variables.log_warnings)
     sql_print_information("Plugin '%s' disabled by command line option",
                           tmp->name.str);
-  DBUG_RETURN(1);
+err:
+  my_cleanup_options(opts);
+  DBUG_RETURN(error);
 }