[issue19883] Integer overflow in zipimport.c

[STINNER Victor]

STINNER Victor added the comment:

Here is a work-in-progress patch.

PyMarshal_ReadShortFromFile() and PyMarshal_ReadLongFromFile() are still wrong: new Unsigned version should be added to marshal.c. I don't know if a C cast to unsigned is enough because long can be larger than 32-bit (ex: on Linux 64-bit):
#if SIZEOF_LONG > 4
        /* Sign extension for 64-bit machines */
        x |= -(x & 0x80000000L);
#endif

I didn't test my patch. Anyone interested to finish the patch?

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Added file: http://bugs.python.org/file33044/zipimport_int_overflow.patch

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<http://bugs.python.org/issue19883>
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