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Fix for Bug #43973 - backup_myisam.test fails on 6.0-bugteam

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The test started failing following the push for BUG#41541.
Some of the algorithms access bytes beyond the input data
and this can affect up to one byte less than "word size"
which is BITS_SAVED / 8. 
      
Fixed by adding (BITS_SAVED / 8) -1 bytes to buffer size
(i.e. Memory Segment #2) to avoid accessing un-allocated data.

myisam/mi_packrec.c:
  Fixed _mi_read_pack_info() method to allocate (BITS_SAVED/8) - 1 
  bytes to the Memory Segment #2
mysql-test/r/myisampack.result:
  Result file for BUG#43973
mysql-test/t/myisampack.test:
  Testcase for BUG#43973
This commit is contained in:
Satya B
2009-04-07 16:54:32 +05:30
parent 72e978828e
commit 10350e2097
3 changed files with 56 additions and 27 deletions
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22
mysql-test/r/myisampack.result
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@@ -38,3 +38,25 @@ SELECT COUNT(*) FROM t1;
COUNT(*)
1024
DROP TABLE t1;
#
# Bug #43973 - backup_myisam.test fails on 6.0-bugteam
#
CREATE DATABASE mysql_db1;
CREATE TABLE mysql_db1.t1 (c1 VARCHAR(5), c2 int);
CREATE INDEX i1 ON mysql_db1.t1 (c1, c2);
INSERT INTO mysql_db1.t1 VALUES ('A',1);
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
INSERT INTO mysql_db1.t1 SELECT * FROM mysql_db1.t1;
FLUSH TABLE mysql_db1.t1;
# Compress the table using MYISAMPACK tool
# Run MYISAMCHK tool on the compressed table
SELECT COUNT(*) FROM mysql_db1.t1 WHERE c2 < 5;
COUNT(*)
128
DROP TABLE mysql_db1.t1;
DROP DATABASE mysql_db1;