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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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18
mysql-test/t/func_time.test
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@ -358,4 +358,22 @@ create table t1 select now() - now(), curtime() - curtime(),
show create table t1;
drop table t1;
#
# 21913: DATE_FORMAT() Crashes mysql server if I use it through
# mysql-connector-j driver.
#
SET NAMES latin1;
SET character_set_results = NULL;
SHOW VARIABLES LIKE '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;
DROP TABLE testBug8868;
SET NAMES DEFAULT;
# End of 4.1 tests