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[3.13] gh-156939: Fix struct.pack('0p', bytes) (GH-157071) - #157131
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If the Pascal string is empty (size=0), do not write the size prefix. Previously, a NUL byte was written outsize the buffer (buffer overflow). In practice, the write remains into allocated memory and is silently ignored: no memory is corrupted. (cherry picked from commit 23525c9) Co-authored-by: Victor Stinner <vstinner@python.org>
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If the Pascal string is empty (size=0), do not write the size prefix.
Previously, a NUL byte was written outsize the buffer (buffer
overflow). In practice, the write remains into allocated memory
and is silently ignored: no memory is corrupted.
(cherry picked from commit 23525c9)
Co-authored-by: Victor Stinner vstinner@python.org