[ python-Bugs-1701409 ] Segfault in c_char_p of ctypes

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Bugs item #1701409, was opened at 2007-04-16 03:45
Message generated for change (Comment added) made by nnorwitz
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>Category: Extension Modules
Group: None
Status: Open
Resolution: None
>Priority: 7
Private: No
Submitted By: sebastien Martini (seb_martini)
>Assigned to: Thomas Heller (theller)
Summary: Segfault in c_char_p of ctypes

Initial Comment:
Hi,

I experienced a segmentation fault (when providing a wrong argument type to c_char_p) in the ctypes module under Linux and with the version 2.5 .


sundae:~$ python
Python 2.5.1c1 (release25-maint, Apr  6 2007, 22:02:36) 
[GCC 4.1.2 (Ubuntu 4.1.2-0ubuntu4)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ctypes import *
>>> c_char_p(42)
zsh: segmentation fault (core dumped)  python
sundae:~$  


Regards,

Sebastien Martini


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>Comment By: Neal Norwitz (nnorwitz)
Date: 2007-04-18 00:37

Message:
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Thanks for the bug report Sebastien.

This bug occurs in 2.5 and in the trunk, so it's not a regression. 
Thomas, could you take a look?  Integers are specifically allowed here
(floats are not).  The problem is when trying to print the repr:

#0  PyString_FromString (str=0x2a <Address 0x2a out of bounds>) at
Objects/stringobject.c:108
#1  z_get (ptr=0x2ae1aa9d6450, size=8) at Modules/_ctypes/cfield.c:1373
#2  Simple_get_value (self=0x2ae1aa9d63f8) at
Modules/_ctypes/_ctypes.c:4007
#3  Simple_repr (self=0x2ae1aa9d63f8) at Modules/_ctypes/_ctypes.c:4095
#4  PyObject_Repr (v=0x2ae1aa9d63f8) at Objects/object.c:361


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Comment By: sebastien Martini (seb_martini)
Date: 2007-04-16 12:40

Message:
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Originator: YES

c_wchar_p also contains this bug.




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