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Issue #9566: _winapi.WriteFile() now truncates length to DWORD_MAX (4294967295)

This commit is contained in:
Victor Stinner 2013-06-24 23:13:24 +02:00
parent bc8ccce729
commit 71765770a4
1 changed files with 5 additions and 2 deletions
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7
Modules/_winapi.c
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@ -62,6 +62,8 @@
#define T_HANDLE T_POINTER
#define DWORD_MAX 4294967295U
/* Grab CancelIoEx dynamically from kernel32 */
static int has_CancelIoEx = -1;
static BOOL (CALLBACK *Py_CancelIoEx)(HANDLE, LPOVERLAPPED);
@ -1142,7 +1144,7 @@ winapi_WriteFile(PyObject *self, PyObject *args, PyObject *kwds)
HANDLE handle;
Py_buffer _buf, *buf;
PyObject *bufobj;
DWORD written;
DWORD len, written;
BOOL ret;
int use_overlapped = 0;
DWORD err;
@ -1170,7 +1172,8 @@ winapi_WriteFile(PyObject *self, PyObject *args, PyObject *kwds)
}
Py_BEGIN_ALLOW_THREADS
ret = WriteFile(handle, buf->buf, buf->len, &written,
len = (DWORD)Py_MIN(buf->len, DWORD_MAX);
ret = WriteFile(handle, buf->buf, len, &written,
overlapped ? &overlapped->overlapped : NULL);
Py_END_ALLOW_THREADS