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Issue #19437: Fix r_PyLong() of marshal module, stop immediatly at first 

failure, don't read any more data
This commit is contained in:
Victor Stinner 2013-10-31 16:56:38 +01:00
parent a9eb38f02a
commit 763b0d19c9
1 changed files with 11 additions and 4 deletions
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15
Python/marshal.c
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@ -612,6 +612,7 @@ r_string(Py_ssize_t n, RFILE *p)
}
p->buf_size = n;
}
if (!p->readable) {
assert(p->fp != NULL);
read = fread(p->buf, 1, n, p->fp);
@ -731,25 +732,31 @@ r_PyLong(RFILE *p)
ob = _PyLong_New(size);
if (ob == NULL)
return NULL;
Py_SIZE(ob) = n > 0 ? size : -size;
for (i = 0; i < size-1; i++) {
d = 0;
for (j=0; j < PyLong_MARSHAL_RATIO; j++) {
md = r_short(p);
if (PyErr_Occurred())
break;
if (PyErr_Occurred()) {
Py_DECREF(ob);
return NULL;
}
if (md < 0 || md > PyLong_MARSHAL_BASE)
goto bad_digit;
d += (digit)md << j*PyLong_MARSHAL_SHIFT;
}
ob->ob_digit[i] = d;
}
d = 0;
for (j=0; j < shorts_in_top_digit; j++) {
md = r_short(p);
if (PyErr_Occurred())
break;
if (PyErr_Occurred()) {
Py_DECREF(ob);
return NULL;
}
if (md < 0 || md > PyLong_MARSHAL_BASE)
goto bad_digit;
/* topmost marshal digit should be nonzero */