[issue12881] ctypes: segfault with large structure field names

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Note that there is at least one other place where alloca() is used with potentially large values: the POINTER() function in callproc.c.
Also, PyUnicode_FromFormat could be used instead of sprintf.

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<http://bugs.python.org/issue12881>
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