Edit report at https://bugs.php.net/bug.php?id=69975&edit=1
ID: 69975
User updated by: jgeert1 at its dot jnj dot com
Reported by: jgeert1 at its dot jnj dot com
Summary: PHP is causing Apache to crash when accessing
nvarchar(max) defined columns
Status: Open
Type: Feature/Change Request
Package: ODBC related
Operating System: Windows Server 2012R2
PHP Version: 5.5.26
Block user comment: N
Private report: N
New Comment:
Wow that was fast :-)
What do I need to do to get a compiled version for Windows 64-bit?
Thanks.
Previous Comments:
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[2015-07-02 14:17:11] cmb@php.net
The following patch has been added/updated:
Patch Name: odbc-wvarchar-native-draft
Revision: 1435846631
URL: https://bugs.php.net/patch-display.php?bug=69975&patch=odbc-wvarchar-native-draft&revision=1435846631
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[2015-07-02 14:16:29] cmb@php.net
Thanks for the traces.
At a first glance the problem is that SQLColAttributes()
requesting SQL_COLUMN_DISPLAY_SIZE for column 5 yields 0 for the
Native Driver, but 1073741823 (0x3fffffff) for the SQL Server
driver, whereby the column type is reported as SQL_WVARCHAR (-9)
and SQL_WLONGVARCHAR (-10), respectively. This results in a buffer
of only 1 byte to be emalloc'd()[1], what's likely to cause
problems.
However, I'm confused, because SQL_WVARCHAR is supposed to request
SQL_DESC_OCTET_LENGTH instead of SQL_COLUMN_DISPLAY_SIZE[2]. Maybe
a driver mapping?
Maybe the attached patch "odbc-wvarchar-native-draft" points in
the right direction?
[1] <https://github.com/php/php-src/blob/PHP-5.5.26/ext/odbc/php_odbc.c#L1020>
[2] <https://github.com/php/php-src/blob/PHP-5.5.26/ext/odbc/php_odbc.c#L995>
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[2015-07-02 13:01:18] jgeert1 at its dot jnj dot com
This is the testscript I've used:
$db_datastage = odbc_connect($dsn,$user,$pwd,SQL_CUR_USE_ODBC);
$res = odbc_exec($db_datastage,"select top 10 * from SN.cmdb_ci");
while ($row = odbc_fetch_array($res)) {
var_dump($row);
}
odbc_close($db_datastage);
This trace is the failing one (using "SQL Server Native Client 11.0" as driver):
https://gist.githubusercontent.com/anonymous/757e0f1fabeefbbb1abb/raw/SQLLOG1
This trace is the successful one (using "SQL Server" as driver):
https://gist.githubusercontent.com/anonymous/6d59f9903ca76d43095d/raw/sqllog2
It looks like it's having an issue when fetching the result (2nd result) as it's
displaying:
DIAG [01004] [Microsoft][SQL Server Native Client 11.0]String data, right truncation (0)
Looks like a small buffer problem somewhere?
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[2015-07-02 12:05:06] jgeert1 at its dot jnj dot com
The odbc trace can be found here:
https://gist.githubusercontent.com/anonymous/761c084d36f586862f08/raw/SQLLOG
Thanks.
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[2015-07-02 11:12:03] cmb@php.net
> Anyway if there's anything I can (investigate,test,..), just let
> me know as I really would like this to be resolved.
It might be helpful if you can post an ODBC trace for the given
test script. If the trace is large, it might be best to put it on
<https://gist.github.com/> or someone else, but not
directly in
this ticket. How to create an ODBC trace is described on
<https://support.microsoft.com/en-us/kb/274551>.
And please make
sure there is no confidential information contained in the trace
(password etc.)
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