Edit report at http://bugs.php.net/bug.php?id=52843&edit=1
ID: 52843
Updated by: fel...@php.net
Reported by: clint at ubuntu dot com
Summary: Segfault when optional parameters are not passed in
to mssql_connect
-Status: Open
+Status: Closed
Type: Bug
Package: MSSQL related
Operating System: Linux
PHP Version: 5.3.3
-Assigned To:
+Assigned To: Felipe
Block user comment: N
New Comment:
This bug has been fixed in SVN.
Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
Thank you for the report, and for helping us make PHP better.
I've committed a slighty modified patch into 5.3 branch and trunk.
Thanks for the patch!
Previous Comments:
------------------------------------------------------------------------
[2010-09-15 04:12:48] fel...@php.net
Automatic comment from SVN on behalf of felipe
Revision: http://svn.php.net/viewvc/?view=revision&revision=303375
Log: - Fixed bug #52843 (Segfault when optional parameters are not
passed in to mssql_connect)
------------------------------------------------------------------------
[2010-09-14 22:56:33] clint at ubuntu dot com
Description:
------------
This was originally reported in Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/php5/+bug/611316
Calling mssql_connect() without all of its string arguments will cause
php to
segfault.
This happens on Ubuntu 10.10 beta, and Ubuntu 10.04. I also compiled php
5.3.3
vanilla with ./configure --with-mssql=/usr, and the script below caused
the
segfault.
The error is in this code around line 575 of ext/mssql/php_mssql.c:
char *host = NULL, *user = NULL, *passwd = NULL;
int host_len, user_len, passwd_len;
zend_bool new_link = 0;
char *hashed_details;
int hashed_details_length;
mssql_link mssql, *mssql_ptr;
char buffer[40];
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|sssb",
&host,
&host_len, &user, &user_len, &passwd, &passwd_len, &new_link) ==
FAILURE) {
return;
}
/* Limit strings to 255 chars to prevent overflow issues in
underlying
libraries */
if(host_len>255) {
host[255] = '\0';
}
if(user_len>255) {
user[255] = '\0';
}
if(passwd_len>255) {
passwd[255] = '\0';
}
If the optional args are not passed in, the len and host parameters will
be
unchanged, and so a null pointer dereference may occur (depending on the
arbitrary value of the _len variables).
Test script:
---------------
php -r 'mssql_connect();'
Expected result:
----------------
I would expect the program to exit without crashing.
Actual result:
--------------
ubu...@domu-12-31-39-03-0d-c3:~/src/php5-5.3.3$ gdb php
GNU gdb (GDB) 7.2-ubuntu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show
copying"
and "show warranty" for details.
This GDB was configured as "i686-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/php...Reading symbols from
/usr/lib/debug/usr/bin/php5...done.
done.
(gdb) run -r 'mssql_connect();'
Starting program: /usr/bin/php -r 'mssql_connect();'
[Thread debugging using libthread_db enabled]
Program received signal SIGSEGV, Segmentation fault.
0xb75ac357 in php_mssql_do_connect (ht=0, return_value=0x88dadb4,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0, persistent=0)
at /home/ubuntu/src/php5-5.3.3/ext/mssql/php_mssql.c:587
587 host[255] = '\0';
(gdb) bt
#0 0xb75ac357 in php_mssql_do_connect (ht=0, return_value=0x88dadb4,
return_value_ptr=0x0, this_ptr=0x0, return_value_used=0, persistent=0)
at /home/ubuntu/src/php5-5.3.3/ext/mssql/php_mssql.c:587
#1 0x083600fa in zend_do_fcall_common_helper_SPEC (execute_data=0x0) at
/home/ubuntu/src/php5-5.3.3/Zend/zend_vm_execute.h:316
#2 0x08336bbe in execute (op_array=0x88db2c0) at
/home/ubuntu/src/php5-
5.3.3/Zend/zend_vm_execute.h:107
#3 0x08300fc3 in zend_eval_stringl (str=0xbffff474 "mssql_connect();",
str_len=16, retval_ptr=0x0, string_name=0x8749440 "Command line code")
at /home/ubuntu/src/php5-5.3.3/Zend/zend_execute_API.c:1192
#4 0x08301162 in zend_eval_stringl_ex (str=0xbffff474
"mssql_connect();",
str_len=16, retval_ptr=0x0, string_name=0x8749440 "Command line code",
handle_exceptions=1) at /home/ubuntu/src/php5-
5.3.3/Zend/zend_execute_API.c:1234
#5 0x083011e3 in zend_eval_string_ex (str=0xbffff474
"mssql_connect();",
retval_ptr=0x0, string_name=0x8749440 "Command line code",
handle_exceptions=1) at /home/ubuntu/src/php5-
5.3.3/Zend/zend_execute_API.c:1245
#6 0x083a3689 in main (argc=3, argv=0xbffff324) at
/home/ubuntu/src/php5-
5.3.3/sapi/cli/php_cli.c:1235
(gdb)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/bug.php?id=52843&edit=1
