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Bug #45796: invalid memory reads and writes when altering merge

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and base tables 

myrg_attach_children() could reuse a buffer that was allocated 
previously based on a definition of a child table. The problem 
was that the child's definition might have been changed, so 
reusing the buffer could lead to crashes or valgrind errors 
under some circumstances. 
 
Fixed by changing myrg_attach_children() so that the 
rec_per_key_part buffer is reused only when the child table
have not changed, and reallocated otherwise (the old buffer is 
deallocated if necessary).
This commit is contained in:
Alexey Kopytov
2009-07-10 17:34:03 +06:00
parent af1f8c6dd8
commit 9cb84f8466
5 changed files with 52 additions and 8 deletions
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14
mysql-test/r/merge.result
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@@ -2127,4 +2127,18 @@ SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP VIEW v1;
DROP TABLE m1, t1;
#
# Bug #45796: invalid memory reads and writes when altering merge and
# base tables
#
CREATE TABLE t1(c1 INT) ENGINE=MyISAM;
CREATE TABLE m1(c1 INT) ENGINE=MERGE UNION=(t1);
ALTER TABLE m1 ADD INDEX idx_c1(c1);
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 ADD INDEX idx_c1(c1);
SELECT * FROM m1;
c1
DROP TABLE m1;
DROP TABLE t1;
End of 5.1 tests