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Bug #11792200 - DIVIDING LARGE NUMBERS CAUSES STACK CORRUPTIONS

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This was a buffer overrun in do_div_mod(), overwriting the internal buffer
of auto variable 'tmp' in Item_func_int_div::val_int.
Result on windows: 'this' is set to zero, and crash.
Ran fine on other platforms (no valgrind warnings),
but this is undefined behaviour on any platform of course.

include/decimal.h:
  Add const qualifiers to function prototypes which are used by sql/my_decimal.h
mysql-test/r/func_math.result:
  New test case.
mysql-test/t/func_math.test:
  New test case.
sql/my_decimal.h:
  Remove several C-style casts:
   - some of the were up-casts, and thus un-necessary
   - some of them should have been const-casts, but it is better to make the
     underlying library functions in (decimal.[h|c]) const instead.
strings/decimal.c:
  Check for buffer overrun in do_div_mod()
  Add const qualifiers to functions which are used by sql/my_decimal.h
This commit is contained in:
Tor Didriksen 2011-03-03 15:25:41 +01:00
commit ef19b3b6cf
5 changed files with 69 additions and 49 deletions
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5
mysql-test/t/func_math.test
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@ -500,3 +500,8 @@ SELECT ((@a:=@b:=1.0) div (@b:=@a:=get_format(datetime, 'usa')));
--echo # Bug #59498 div function broken in mysql-trunk
--echo #
SELECT 1 div null;
--echo #
--echo # Bug #11792200 - DIVIDING LARGE NUMBERS CAUSES STACK CORRUPTIONS
--echo #
select (1.175494351E-37 div 1.7976931348623157E+308);