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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
parent 76f65b3fb3
commit 52f3977eef
3 changed files with 36 additions and 1 deletions
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7
sql/sql_string.cc
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@ -248,6 +248,10 @@ bool String::copy(const char *str,uint32 arg_length, CHARSET_INFO *cs)
0 No conversion needed
1 Either character set conversion or adding leading zeros
(e.g. for UCS-2) must be done
NOTE
to_cs may be NULL for "no conversion" if the system variable
character_set_results is NULL.
*/
bool String::needs_conversion(uint32 arg_length,
@ -256,7 +260,8 @@ bool String::needs_conversion(uint32 arg_length,
uint32 *offset)
{
*offset= 0;
if ((to_cs == &my_charset_bin) ||
if (!to_cs ||
(to_cs == &my_charset_bin) ||
(to_cs == from_cs) ||
my_charset_same(from_cs, to_cs) ||
((from_cs == &my_charset_bin) &&