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BUG#11766720 - setting storage engine to null segfaults mysqld

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MONTHNAME(0) claims that it is about to return NOT NULL
value, whereas it actually returns NULL.

As a result storage_engine variable (which cannot be NULL)
protection was bypassed and NULL value was accepted, causing
server crash.

Fixed MONTHNAME(0) to report valid NULL flag.
This commit is contained in:
Sergey Vojtovich
2011-02-18 11:10:30 +03:00
parent b2089dc80a
commit 4daaa02880
4 changed files with 27 additions and 12 deletions
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10
mysql-test/r/func_time.result
View File

@@ -136,7 +136,7 @@ dayname("1962-03-03") dayname("1962-03-03")+0
Saturday 5
select monthname("1972-03-04"),monthname("1972-03-04")+0;
monthname("1972-03-04") monthname("1972-03-04")+0
March 3
March 0
select time_format(19980131000000,'%H|%I|%k|%l|%i|%p|%r|%S|%T');
time_format(19980131000000,'%H|%I|%k|%l|%i|%p|%r|%S|%T')
00|12|0|12|00|AM|12:00:00 AM|00|00:00:00
@@ -1368,3 +1368,11 @@ SELECT SUBDATE(STR_TO_DATE(NULL,0), INTERVAL 1 HOUR);
SUBDATE(STR_TO_DATE(NULL,0), INTERVAL 1 HOUR)
NULL
#
# BUG#59895 - setting storage engine to null segfaults mysqld
#
SELECT MONTHNAME(0), MONTHNAME(0) IS NULL, MONTHNAME(0) + 1;
MONTHNAME(0) MONTHNAME(0) IS NULL MONTHNAME(0) + 1
NULL 1 NULL
SET storage_engine=NULL;
ERROR 42000: Variable 'storage_engine' can't be set to the value of 'NULL'
#