ID: 31288 Comment by: kurt at indermaur dot com Reported By: m dot brachner at gmx dot at Status: Open Bug Type: Reproducible crash Operating System: Windows XP PHP Version: 5CVS-2004-12-24 (dev) New Comment:
Failed for me with a "Segmentation Violation" on freebsd, php 4.3.10 and php 5.0.3 (switched to 5.x after encountering this bug), with mysql 4.0.22. I tracked it down to line 2250 of ext/mysql/php_mysql.c: add_property_string(return_value, "def",(mysql_field->def?mysql_field->def :empty_string), 1); According to mysql's documentation (http://dev.mysql.com/doc/mysql/en/C_API_datatypes.html, with my emphasis added): char * def - The default value of this field, as a null-terminated string. ***This is set only if you use mysql_list_fields()***. My guess is that *def is never initialized, so it may very well not be null, and then just about any attempt to retrieve its value will result in a segmentation violation (or whatever your OS calls a reference to memory outside the program's control). A simple workaround for me was to comment out line 2250. Previous Comments: ------------------------------------------------------------------------ [2004-12-25 18:53:53] m dot brachner at gmx dot at Using CGI Version Internet Information Server Version 5.1 ------------------------------------------------------------------------ [2004-12-25 18:52:13] m dot brachner at gmx dot at Using CGI Version Internet Information Server Version 5.1 ------------------------------------------------------------------------ [2004-12-24 17:18:21] m dot brachner at gmx dot at Description: ------------ mysql_fetch_field produces an PHP-Crash. A Modal Window pops up (I have a German XP): php-cgi.exe Error in Application The instruction at '0x1000589c' referenced memory at '0x00000001'. The memory could not be read. Click OK to terminate the program. MySQL Version 4.0.18 Reproduce code: --------------- <?php $conn = mysql_connect('localhost:3306', 'root', ''); mysql_select_db('odb'); $result = mysql_query('select * from classes'); /* get column metadata */ $i = 0; while ($i < mysql_num_fields($result)) { echo "Information for column $i:<br />\n"; $meta = mysql_fetch_field($result, $i); $i++; } mysql_free_result($result); ?> Expected result: ---------------- mysql_fetch_field should do the documented operations. Actual result: -------------- mysql_fetch_field produces an PHP-Crash. A Modal Window pops up (I have a German XP): php-cgi.exe Error in Application The instruction at '0x1000589c' referenced memory at '0x00000001'. The memory could not be read. Click OK to terminate the program. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=31288&edit=1
