#39134 [Opn->Fbk]: PHP + FreeTDS 0.64 crashes when TEXT field with empty string encountered

ID: 39134 Updated by: tony2001@php.net Reported By: jr-phpbugs at cedric dot unob dot cz -Status: Open +Status: Feedback Bug Type: MSSQL related Operating System: linux (irrelevant) PHP Version: 4.4.4 New Comment: Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2006-10-12 09:32:09] jr-phpbugs at cedric dot unob dot cz Since I omitted double-quotes at the end of the query, here's the corrected one: $query="SELECT test_text FROM test WHERE test_id=2"; ------------------------------------------------------------------------ [2006-10-12 08:45:07] jr-phpbugs at cedric dot unob dot cz Description: ------------ PHP, compiled with --with-sybase-ct=/usr/localFreeTDS crashes with segmentation fault on SELECT from column of type TEXT with empty string value. Observed on PHP compiled with --with-sybase-ct=/path/to/freetds-0.64/prefix , against MSSQL server 2000 Affects FreeTDS 0.64 and 0.64.1 (with 'post64.patch.gz' applied). Has not been observed with FreeTDS 0.63. FreeTDS 0.64 alone (without PHP) is not affected. Possible bug in ext/sybase_ct/php_sybase_ct.c Reproduce code: --------------- in MSSQL Enterprise manager: CREATE TABLE [dbo].[TEST] ( [TEST_ID] [int] IDENTITY (1, 1) NOT NULL , [TEST_VALUE] [int] NOT NULL , [TEST_TEXT] [text] NULL ) insert into TEST (TEST_VALUE) values ('5'); insert into TEST (TEST_VALUE,TEST_TEXT) values ('6',''); in PHP script: ... $query="SELECT test_text FROM test WHERE test_id=2; $res=mssql_query($query,$db); Expected result: ---------------- Empty string. Actual result: -------------- PHP crashes with segmentation fault. CLI version: - crash with "segmentation fault" message libphp4.so version: - affected thread produces a line "[notice] child pid XXXXX exit signal Segmentation fault (11)" in Apache's error log. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=39134&edit=1