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Bug#21913: DATE_FORMAT() Crashes mysql server if I use it through mysql-connector-j driver.

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Variable character_set_results can legally be NULL (for "no conversion.")
This could result in a NULL deref that crashed the server.  Fixed.

(Although ran some additional precursory tests to see whether I could break
anything else, but no breakage so far.)


mysql-test/r/func_time.result:
  Bug#21913: DATE_FORMAT() Crashes mysql server if I use it through mysql-connector-j driver.
  
  Prove DATE_FORMAT() no longer crashes the server when character_set_results is
  NULL (which is a legal value and means, "no conversion").
mysql-test/t/func_time.test:
  Bug#21913: DATE_FORMAT() Crashes mysql server if I use it through mysql-connector-j driver.
  
  Prove DATE_FORMAT() no longer crashes the server when character_set_results is
  NULL (which is a legal value and means, "no conversion").
sql/sql_string.cc:
  Bug#21913: DATE_FORMAT() Crashes mysql server if I use it through mysql-connector-j driver.
  
  Avoid NULL deref in my_charset_same() -- if !to_cs, we won't need to compare
  because it is magic for, "no conversion."
This commit is contained in:
unknown 2006-09-04 09:13:40 +02:00
commit 52f3977eef
3 changed files with 36 additions and 1 deletions
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12
mysql-test/r/func_time.result
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@ -688,3 +688,15 @@ t1 CREATE TABLE `t1` (
`from_unixtime(1) + 0` double(23,6) default NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
SET NAMES latin1;
SET character_set_results = NULL;
SHOW VARIABLES LIKE 'character_set_results';
Variable_name Value
character_set_results
CREATE TABLE testBug8868 (field1 DATE, field2 VARCHAR(32) CHARACTER SET BINARY);
INSERT INTO testBug8868 VALUES ('2006-09-04', 'abcd');
SELECT DATE_FORMAT(field1,'%b-%e %l:%i%p') as fmtddate, field2 FROM testBug8868;
fmtddate field2
Sep-4 12:00AM abcd
DROP TABLE testBug8868;
SET NAMES DEFAULT;