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[2.7] bpo-38540: Fix possible leak in PyArg_Parse for "es#" and "et#". (GH-16869). #16877

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Merged
serhiy-storchaka merged 1 commit into from
Oct 21, 2019
Merged

[2.7] bpo-38540: Fix possible leak in PyArg_Parse for "es#" and "et#". (GH-16869). #16877

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/C API/2019-10-21-09-24-03.bpo-38540.314N_T.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fixed possible leak in :c:func:`PyArg_Parse` and similar functions for
format units ``"es#"`` and ``"et#"`` when the macro
:c:macro:`PY_SSIZE_T_CLEAN` is not defined.
14 changes: 13 additions & 1 deletion Python/getargs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1156,7 +1156,19 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
memcpy(*buffer,
PyString_AS_STRING(s),
size + 1);
STORE_SIZE(size);

if (flags & FLAG_SIZE_T) {
*q2 = size;
}
else {
if (INT_MAX < size) {
Py_DECREF(s);
PyErr_SetString(PyExc_OverflowError,
"size does not fit in an int");
return converterr("", arg, msgbuf, bufsize);
}
*q = (int)size;
}
} else {
/* Using a 0-terminated buffer:

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