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Bug #41888 Segfault when attempting to update PDO LOB column in a stream wrapper
Submitted: 2007-07-03 12:58 UTC Modified: 2009-08-17 17:35 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: hans at velum dot net Assigned: iliaa (profile)
Status: Closed Package: PDO related
PHP Version: 5.2.4 OS: Gentoo Linux
Private report: No CVE-ID: None
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 [2007-07-03 12:58 UTC] hans at velum dot net
Description:
------------
I am trying to use PDO LOB columns with PostgreSQL within a user-defined stream wrapper class.  PDO is correctly handling the LOB with PostgreSQL as stream resources; however, when I attempt to update a LOB column using another stream (e.g. php://temp, php://memory) in my stream_flush() command, I get a segmentation fault.

Reproduce code:
---------------
I was able to create a basic reproduce case; however, it is more than 20 lines of code.

Here is a link to a snippet that creates the stream wrapper and attempts to perform an update:

http://pastebin.com/941246

This consistently segfaults in my environment.

Expected result:
----------------
No segfault.

Actual result:
--------------
Segfault.  I have PHP compiled w/ debug flags; however, the backtrace in this case is very unhelpful.


Program terminated with signal 11, Segmentation fault.
#0  0x0830aabd in _zval_dtor_func ()
(gdb) bt
#0  0x0830aabd in _zval_dtor_func ()
#1  0x082fdf90 in ?? ()
#2  0x0870bf34 in ?? ()
#3  0x085bdec4 in ?? ()
#4  0x00000023 in ?? ()
#5  0x085c0268 in ?? ()
#6  0x00000001 in ?? ()
#7  0x00000001 in ?? ()
#8  0xbf8f0108 in ?? ()
#9  0x082fe146 in _zval_ptr_dtor ()
Backtrace stopped: frame did not save the PC
(gdb)


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 [2007-09-06 13:36 UTC] hans at velum dot net
Any update on this ticket?  I just confirmed that this is still segfaulting in latest 5.2.4 PHP release.
 [2007-09-06 13:40 UTC] hans at velum dot net
Note, here is some revised reproduce code (there was a bug in the original code such that it was creating two DB connections): http://pastebin.com/f40fa427d

Thanks!
 [2007-10-01 20:04 UTC] hans at velum dot net
Updating version to reflect that problem is still present in 5.2.4
 [2008-01-14 20:53 UTC] hans at velum dot net
Any idea when this issue might get fixed?  This is a big deal to us, since this bug prevents us from swapping out filesystem-based storage with a db-storage engine.
 [2009-06-16 20:06 UTC] hans at velum dot net
Indeed - this appears to be fixed in latest PHP 5.2.x release.  Thanks!
 [2009-06-16 20:09 UTC] pajoye@php.net
> closed
 
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