BUG#9101 - RELEASE/ROLLBACK TO SAVEPOINT did not forget savepoints correctly

mysql-test/r/innodb.result:
  more savepoint tests
mysql-test/t/innodb.test:
  more savepoint tests

mysql-test/r/innodb.result

@@ -262,7 +262,11 @@ n
 5
 6
 7
-rollback to savepoint `savept2`;
+savepoint savept3;
+rollback to savepoint savept2;
+rollback to savepoint savept3;
+ERROR 42000: SAVEPOINT savept3 does not exist
+rollback to savepoint savept2;
 release savepoint `my_savepoint`;
 select n from t1;
 n
@@ -272,6 +276,8 @@ n
 7
 rollback to savepoint `my_savepoint`;
 ERROR 42000: SAVEPOINT my_savepoint does not exist
+rollback to savepoint savept2;
+ERROR 42000: SAVEPOINT savept2 does not exist
 insert into t1 values (8);
 savepoint sv;
 commit;

mysql-test/t/innodb.test

@@ -130,17 +130,26 @@ insert into t1 values (6);
 insert into t1 values (4);
 select n from t1;
 set autocommit=0;
+#
+# savepoints
+#
 begin;
 savepoint `my_savepoint`;
 insert into t1 values (7);
 savepoint `savept2`;
 insert into t1 values (3);
 select n from t1;
-rollback to savepoint `savept2`;
+savepoint savept3;
+rollback to savepoint savept2;
+--error 1305
+rollback to savepoint savept3;
+rollback to savepoint savept2;
 release savepoint `my_savepoint`;
 select n from t1;
 -- error 1305
 rollback to savepoint `my_savepoint`;
+--error 1305
+rollback to savepoint savept2;
 insert into t1 values (8);
 savepoint sv;
 commit;

sql/sql_parse.cc

@@ -3805,21 +3805,21 @@ mysql_execute_command(THD *thd)
     break;
   case SQLCOM_RELEASE_SAVEPOINT:
   {
-    SAVEPOINT **sv;
-    for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
+    SAVEPOINT *sv;
+    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
     {
       if (my_strnncoll(system_charset_info,
                        (uchar *)lex->ident.str, lex->ident.length,
-                       (uchar *)(*sv)->name, (*sv)->length) == 0)
+                       (uchar *)sv->name, sv->length) == 0)
         break;
     }
-    if (*sv)
+    if (sv)
     {
-      if (ha_release_savepoint(thd, *sv))
+      if (ha_release_savepoint(thd, sv))
         res= TRUE; // cannot happen
       else
         send_ok(thd);
-      *sv=(*sv)->prev;
+      thd->transaction.savepoints=sv->prev;
     }
     else
       my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
@@ -3827,17 +3827,17 @@ mysql_execute_command(THD *thd)
   }
   case SQLCOM_ROLLBACK_TO_SAVEPOINT:
   {
-    SAVEPOINT **sv;
-    for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
+    SAVEPOINT *sv;
+    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
     {
       if (my_strnncoll(system_charset_info,
                        (uchar *)lex->ident.str, lex->ident.length,
-                       (uchar *)(*sv)->name, (*sv)->length) == 0)
+                       (uchar *)sv->name, sv->length) == 0)
         break;
     }
-    if (*sv)
+    if (sv)
     {
-      if (ha_rollback_to_savepoint(thd, *sv))
+      if (ha_rollback_to_savepoint(thd, sv))
         res= TRUE; // cannot happen
       else
       {
@@ -3848,7 +3848,7 @@ mysql_execute_command(THD *thd)
                        ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
         send_ok(thd);
       }
-      *sv=(*sv)->prev;
+      thd->transaction.savepoints=sv;
     }
     else
       my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);