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Write the filename into a temporary buffer instead of reusing prefix.
The problem is that join() modifies prefix inplace. If prefix is not
normalized, join() can make prefix shorter and so gotlandmark()
does modify prefix instead of returning it unmodified.

https://bugs.python.org/issue38322

Write the filename into a temporary buffer instead of reusing prefix. The problem is that join() modifies prefix inplace. If prefix is not normalized, join() can make prefix shorter and so gotlandmark() does modify prefix instead of returning it unmodified.

jacobneiltaylor pushed a commit to jacobneiltaylor/cpython that referenced this pull request

Dec 5, 2019

Write the filename into a temporary buffer instead of reusing prefix. The problem is that join() modifies prefix inplace. If prefix is not normalized, join() can make prefix shorter and so gotlandmark() does modify prefix instead of returning it unmodified.