#45146 [NEW]: unixODBC (PDO) queries are causing segmentation error
From: csa at dside dot dyndns dot org
Operating system: Gentoo Linux
PHP version: 5.2.6
PHP Bug Type: PDO related
Bug description: unixODBC (PDO) queries are causing segmentation error
Description:
------------
ODBC (PDO) queries are causing segmentation error on 64 bit platforms
under certain conditions if unixODBC is used to provide ODBC interface. The
actual problem is definition of 'pdo_odbc_column' structure (in
ext/pdo_odbc/php_pdo_odbc_int.h). The 'fetched_len' member is defined
'long'. However, in odbc_stmt.c (odbc_stmt_describe) the pointer on this
member is passed as argument to SQLBindCol (ODBC library) which expects
pointer on SQLINTEGER instead. On 64bit platforms unixODBC defines the
'SQLINTEGER' as 'int ' (a 32 bit number) and 'long' is a 64 bit
number.
On x86_64 this does not cause problems while negative numbers are not
used. Therefore, the bug is rarely introduces itself. Unfortunately, in
the cases of NULL valued-columns it is possible what '-1' is stored in
this member variable. In this case the PhP while end up with segmentation
fault.
I don't have access to formal ODBC specification and, therefore,don't
really know if unixODBC correct in its implementation or violates
specification. [ MS defines SQLINTEGER as 'long int'. But 'long int' on
win64 is 32bit number. In Linux, 'long int' is 64bit and 'int' is 32bit ].
However, in either case the fix is very simple and will save php developers
from lot headache.
The proposed patch is available here:
http://dside.dyndns.org/projects/patches.dir/php-ds-odbc64.patch
--
Edit bug report at http://bugs.php.net/?id=45146&edit=1
--
Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=45146&r=trysnapshot52
Try a CVS snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=45146&r=trysnapshot53
Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=45146&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=45146&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=45146&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=45146&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=45146&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=45146&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=45146&r=support
Expected behavior: http://bugs.php.net/fix.php?id=45146&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=45146&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=45146&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=45146&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=45146&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=45146&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=45146&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=45146&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=45146&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=45146&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=45146&r=mysqlcfg
Thread (2 messages)
- csa at dside dot dyndns dot org