Bug #63075 [Com]: PHP Segfault in PDO ODBC Execute

Edit report at https://bugs.php.net/bug.php?id=63075&edit=1

 ID:                 63075
 Comment by:         kubaszymanowski at gmail dot com
 Reported by:        Ew6jQ8tSJhf3 at dyweni dot com
 Summary:            PHP Segfault in PDO ODBC Execute
 Status:             Feedback
 Type:               Bug
 Package:            PDO ODBC
 Operating System:   Linux x86_64 (CentOS 5.8 final)
 PHP Version:        5.4.6
 Block user comment: N
 Private report:     N

 New Comment:

@requinix
I have compiled PHP 7.1.3 from source with no extensions but PDO-ODBC and it works. Previously I have been installing PHP using apt-get from Ondřej Surý. I will now try to replicate the production configuration(all needed extensions) from source and get back to you if I get the SEGFAULT.


Previous Comments:
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[2017-03-30 14:58:05] [email protected]

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.

@kubaszymanowski, can you generate and post a backtrace?

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[2017-03-30 14:32:54] kubaszymanowski at gmail dot com

I get the same error running PHP 5.6 and 7.1 on Ubuntu 16.04.1

Files I used for testing:

<?php
$c = odbc_connect("DSN_NAME", "Master", "pass");
odbc_exec($c, "SELECT COUNT(*) FROM dp");

<?php
$pdo = new PDO("odbc:DSN_NAME");
$pdo->query("SELECT COUNT(*) FROM dp");

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[2012-09-12 19:51:50] Ew6jQ8tSJhf3 at dyweni dot com

The 5.2.17-6.ius.el5 version of PHP from the IUS repositories works OK too.

FYI IUS is http://iuscommunity.org/

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[2012-09-12 19:44:03] Ew6jQ8tSJhf3 at dyweni dot com

I tested the 5.3.16-1.ius.el5 version of PHP from the IUS repository... These have the same issue.

I tested the 5.3.3-13.el5_8 version of PHP from the CentOS5 Updates repository... These work OK.

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[2012-09-12 19:22:30] Ew6jQ8tSJhf3 at dyweni dot com

Breaking GDB at /usr/src/debug/php-5.4.6/ext/pdo/pdo_stmt.c:514:


(gdb) p stmt
$6 = (pdo_stmt_t *) 0x2aaaab283960
(gdb) p *stmt
$7 = {std = {ce = 0xbbd490, properties = 0x0, properties_table = 0x2aaaab284440, guards = 0x0}, methods = 0x2aaab09b9640, driver_data = 0x2aaaab283ad8, executed = 0, 
supports_placeholders = 2, _reserved = 0, column_count = 0,
  columns = 0x0, database_object_handle = {value = {lval = 46909632806913, dval = 2.3176438028923198e-310, str = {val = 0x2aaa00000001 <Address 0x2aaa00000001 out of 
bounds>, len = -1336223392}, ht = 0x2aaa00000001, obj = {handle = 1,
        handlers = 0x2aaab05ad960}}, refcount__gc = 2, type = 5 '\005', is_ref__gc = 0 '\000'}, dbh = 0x2aaaab2842b0, bound_params = 0x0, bound_param_map = 0x0, 
bound_columns = 0x0, row_count = 0,
  query_string = 0x2aaaab284c20 "SELECT fid, original_filename, dateUploaded, filesize, client FROM upload ORDER BY dateUploaded DESC", query_stringlen = 100, 
active_query_string = 0x0, active_query_stringlen = 0, error_code = "00000",
  lazy_object_ref = {value = {lval = 0, dval = 0, str = {val = 0x0, len = 0}, ht = 0x0, obj = {handle = 0, handlers = 0x0}}, refcount__gc = 0, type = 0 '\000', is_ref__gc 
= 0 '\000'}, refcount = 1, default_fetch_type = PDO_FETCH_BOTH,
  fetch = {column = 0, cls = {ce = 0x0, ctor_args = 0x0, retval_ptr = 0x0, fci = {size = 0, function_table = 0x0, function_name = 0x0, symbol_table = 0x0, retval_ptr_ptr = 
0x0, param_count = 0, params = 0x0, object_ptr = 0x0,
        no_separation = 0 '\000'}, fcc = {initialized = 0 '\000', function_handler = 0x0, calling_scope = 0x0, called_scope = 0x0, object_ptr = 0x0}}, func = {function = 
0x0, fetch_args = 0x0, object = 0x0, fci = {size = 0,
        function_table = 0x0, function_name = 0x0, symbol_table = 0x0, retval_ptr_ptr = 0x0, param_count = 0, params = 0x0, object_ptr = 0x0, no_separation = 0 '\000'}, 
fcc = {initialized = 0 '\000', function_handler = 0x0,
        calling_scope = 0x0, called_scope = 0x0, object_ptr = 0x0}, values = 0x0}, into = 0x0}, named_rewrite_template = 0x0}


(gdb) n
515                     if (stmt->active_query_string && stmt->active_query_string != stmt->query_string) {


(gdb) p stmt
$12 = (pdo_stmt_t *) 0x2aaaffffffff
(gdb) p *stmt
Cannot access memory at address 0x2aaaffffffff

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