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BUG#51877 - HANDLER interface causes invalid memory read

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Invalid memory read if HANDLER ... READ NEXT is executed
after failed (e.g. empty table) HANDLER ... READ FIRST.

The problem was that we attempted to perform READ NEXT,
whereas there is no pivot available from failed READ FIRST.

With this fix READ NEXT after failed READ FIRST equals
to READ FIRST.

This bug affects MyISAM tables only.
This commit is contained in:
Sergey Vojtovich
2010-03-25 15:49:01 +04:00
parent 8d514f2145
commit ba33a3357d
5 changed files with 55 additions and 8 deletions
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13
mysql-test/r/handler_myisam.result
View File

@ -756,4 +756,17 @@ TRUNCATE t1;
HANDLER t1 READ FIRST;
ERROR 42S02: Unknown table 't1' in HANDLER
DROP TABLE t1;
#
# BUG#51877 - HANDLER interface causes invalid memory read
#
CREATE TABLE t1(a INT, KEY(a));
HANDLER t1 OPEN;
HANDLER t1 READ a FIRST;
a
INSERT INTO t1 VALUES(1);
HANDLER t1 READ a NEXT;
a
1
HANDLER t1 CLOSE;
DROP TABLE t1;
End of 5.1 tests