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gh-96577: Fixes buffer overrun in _msi module #96633

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merged 1 commit into from
Sep 7, 2022
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gh-96577: Fixes buffer overrun in _msi module #96633

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Windows/2022-09-07-00-11-33.gh-issue-96577.kV4K_1.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fixes a potential buffer overrun in :mod:`msilib`.
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You may move this to the security category, but I'm fine with the Windows category.

4 changes: 2 additions & 2 deletions PC/_msi.c
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Expand Up @@ -360,7 +360,7 @@ msierror(int status)
int code;
char buf[2000];
char *res = buf;
DWORD size = sizeof(buf);
DWORD size = Py_ARRAY_LENGTH(buf);
MSIHANDLE err = MsiGetLastErrorRecord();

if (err == 0) {
Expand Down Expand Up @@ -484,7 +484,7 @@ _msi_Record_GetString_impl(msiobj *self, unsigned int field)
unsigned int status;
WCHAR buf[2000];
WCHAR *res = buf;
DWORD size = sizeof(buf);
DWORD size = Py_ARRAY_LENGTH(buf);
PyObject* string;

status = MsiRecordGetStringW(self->h, field, res, &size);
Expand Down