Issue 5203: ctypes segfaults when passing a unicode string to a function without argtypes (original) (raw)

Issue5203

Created on 2009-02-10 12:48 by amaury.forgeotdarc, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (2)
msg81544 - (view)	Author: Amaury Forgeot d'Arc (amaury.forgeotdarc) *	Date: 2009-02-10 12:48
The following code segfaults on platforms where HAVE_USABLE_WCHAR_T is not defined (for example: narrow unicode build and sizeof(wchar_t)==4) >>> from ctypes import * >>> import ctypes.util >>> CDLL(ctypes.util.find_library('c')).wcslen(u'text') (it works if the argtypes member is defined) The reason is a non initialized structure, and the correction is trivial: --- Modules/_ctypes/callproc.c~ 2007-06-15 19:10:41.000000000 +0200 +++ Modules/_ctypes/callproc.c 2009-02-10 13:28:10.000000000 +0100 @@ -538,6 +538,7 @@ int size = PyUnicode_GET_SIZE(obj); size += 1; /* terminating NUL */ size *= sizeof(wchar_t); + pa->ffi_type = &ffi_type_pointer; pa->value.p = PyMem_Malloc(size); if (!pa->value.p) { PyErr_NoMemory();
msg81582 - (view)	Author: Thomas Heller (theller) *	Date: 2009-02-10 19:07
Fixed in trunk (rev 69505) and release26-maint (rev 69506). The bug was already fixed in a different way in py3k and release30-maint although in a different way, I merged this exact fix anyway (rev 69507 and rev 69508). Thanks.