PHP 4.0 Bug #7632: Segmentation fault upon call to sybase_connect()

From: serge@panix.com Operating system: Solaris 8 PHP version: 4.0.3pl1 PHP Bug Type: Sybase (dblib) related Bug description: Segmentation fault upon call to sybase_connect() Setup: Host: Sun SparcServer 20 w/128Mb RAM, one CPU O/S: Solaris 8 GCC: 2.95.2 GDB: 5.0 PHP: 4.0.3pl1 PHP Config Args: now lost after a few changes (sorry), but definetely had these: --with-sybase=<path to sybase> --with-xml --enable-track-vars Problem: The following PHP script: <?php global $s_connection; $s_connection = sybase_connect ( "SYBSRV", "user", "password" ) or die("Could not make SYBASE connection"); echo "<b>Connected</b>"; sybase_close($s_connection); ?> invoked as /usr/local/bin/php <path to script>/test.php always resulted in a "Segmentation fault (core dumped)." GDB stack trace showed the following: (gdb) bt #0 0xef132b9c in strlen () from /usr/lib/libc.so.1 #1 0xef547ae8 in dbsetlname () from /usr/local/app/sybase/lib/libsybdb.so #2 0x8838c in php_sybase_do_connect (ht=3, return_value=0x145d58, this_ptr=0x0, return_value_used=1, persistent=0) at php_sybase_db.c:354 #3 0x888c8 in php_if_sybase_connect (ht=3, return_value=0x145d58, this_ptr=0x0, return_value_used=1) at php_sybase_db.c:512 #4 0xd3038 in execute () #5 0xa1fe4 in zend_execute_scripts (type=8, file_count=3) at zend.c:717 #6 0x26f70 in php_execute_script (primary_file=0xeffffb88) at main.c:1200 #7 0x24ebc in main (argc=2, argv=0xeffffc14) at cgi_main.c:715 (gdb) Stepping through ext/sybase/php_sybase_db.c:php_sybase_do_connect() with gdb showed that the segmentation fault occured at line 354 353: if (charset) { 354: DBSETLCHARSET(sybase.login,charset); 355: } and was caused by the uninitialized `charset' which contained an out-of-range address. Changing the declaration of charset at line 257 from char *user,*passwd,*host,*charset; to char *user,*passwd,*host,*charset=(char *)0; and recompililng php seemed to alleviate the problem. Thanks for looking into this, Sergey P.S. php_sybase_db.c's ident was /* $Id: php_sybase_db.c,v 1.4 2000/09/03 17:43:09 derick Exp $ */ -- Edit Bug report at: http://bugs.php.net/?id=7632&edit=1