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Richard Oudkerk 2013-02-13 12:32:32 +00:00
commit 6d40134eba
2 changed files with 18 additions and 11 deletions
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22
Modules/mmapmodule.c
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@ -1162,7 +1162,6 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
# endif
if (fd != -1 && fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
if (map_size == 0) {
off_t calc_size;
if (st.st_size == 0) {
PyErr_SetString(PyExc_ValueError,
"cannot mmap an empty file");
@ -1173,13 +1172,12 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
"mmap offset is greater than file size");
return NULL;
}
calc_size = st.st_size - offset;
map_size = calc_size;
if (map_size != calc_size) {
if (st.st_size - offset > PY_SSIZE_T_MAX) {
PyErr_SetString(PyExc_ValueError,
"mmap length is too large");
return NULL;
}
return NULL;
}
map_size = (Py_ssize_t) (st.st_size - offset);
} else if (offset + (size_t)map_size > st.st_size) {
PyErr_SetString(PyExc_ValueError,
"mmap length is greater than file size");
@ -1376,11 +1374,13 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
Py_DECREF(m_obj);
return NULL;
}
if (offset - size > PY_SSIZE_T_MAX)
/* Map area too large to fit in memory */
m_obj->size = (Py_ssize_t) -1;
else
m_obj->size = (Py_ssize_t) (size - offset);
if (size - offset > PY_SSIZE_T_MAX) {
PyErr_SetString(PyExc_ValueError,
"mmap length is too large");
Py_DECREF(m_obj);
return NULL;
}
m_obj->size = (Py_ssize_t) (size - offset);
} else {
m_obj->size = map_size;
size = offset + map_size;