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SF bug # 585792, Invalid mmap crashes Python interpreter

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Raise ValueError if user passes a size to mmap which is larger
than the file.
This commit is contained in:
Neal Norwitz 2002-09-05 21:48:07 +00:00
parent 7165af23e6
commit b567392bbf
4 changed files with 30 additions and 1 deletions
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12
Modules/mmapmodule.c
View file

@ -850,6 +850,9 @@ _GetMapSize(PyObject *o)
static PyObject *
new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
{
#ifdef HAVE_FSTAT
struct stat st;
#endif
mmap_object *m_obj;
PyObject *map_size_obj = NULL;
int map_size;
@ -890,7 +893,14 @@ new_mmap_object(PyObject *self, PyObject *args, PyObject *kwdict)
return PyErr_Format(PyExc_ValueError,
"mmap invalid access parameter.");
}
#ifdef HAVE_FSTAT
if (fstat(fd, &st) == 0 && (size_t)map_size > st.st_size) {
PyErr_SetString(PyExc_ValueError,
"mmap length is greater than file size");
return NULL;
}
#endif
m_obj = PyObject_New (mmap_object, &mmap_object_type);
if (m_obj == NULL) {return NULL;}
m_obj->size = (size_t) map_size;