gh-99240: Reset pointer to NULL when the pointed memory is freed in argument parsing by colorfulappl · Pull Request #99890 · python/cpython · GitHub
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In the family of _PyArg_Parse functions, pointers can be passed in as arguments to store the parsed PyArgs.
If a pointer is assigned to newly allocated memory and the memory is freed as a result of an error while parsing the subsequent PyArgs, the pointer should be set to NULL; otherwise, it leaks the freed memory.