Issue Details (XML | Word | Printable)

Key: CORE-3374
Type: Bug Bug
Status: Resolved Resolved
Resolution: Fixed
Priority: Major Major
Assignee: Dmitry Yemanov
Reporter: Dmitry Yemanov
Votes: 0
Watchers: 0
Operations

If you were logged in you would be able to see more operations.
Firebird Core

Server may crash or corrupt data if SELECT WITH LOCK is issued against records not in the latest format

Created: 04/Mar/11 03:45 PM   Updated: 27/Mar/14 12:08 PM
Component/s: Engine
Affects Version/s: 2.1.0, 2.0.4, 2.1.1, 2.0.5, 2.1.2, 2.1.3, 1.5.6, 3.0 Initial, 2.0.6, 2.5.0, 2.1.4
Fix Version/s: 2.5.1, 2.0.7, 2.1.5, 3.0 Alpha 1

Time Tracking:
Not Specified

Issue Links:
Relate
 

Planning Status: Unspecified


 Description  « Hide
Test case:

create table test (col1 int, col2 varchar(10), col3 date);
insert into test values (1, 'qwerty', current_date);

alter table test drop col2;
select * from test order by col1 with lock; -- crash here

Prerequisites:

1) Sorting must be present (in order to set the re-fetch flag)
2) The on-disk record must be in the prior format which must be longer than the current one

In this case deallocated memory is accessed which may lead to either crashing (most probably) or record/index errors.


 All   Comments   Work Log   Change History   Version Control   Subversion Commits      Sort Order: Ascending order - Click to sort in descending order
There are no comments yet on this issue.