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potential nullptr dereference + use of uninitialized memory in fileutils #102281

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interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error
@maxbachmann

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@maxbachmann

Bug report

cpython/Python/fileutils.c

Lines 2161 to 2162 in6daf42b

join_relfile(filename,bufsize,dirname,relfile);
returnfilename;
can lead to use of uninitialized memory whenjoin_relfile fails.

cpython/Python/fileutils.c

Lines 2197 to 2199 in6daf42b

_Py_normpath(wchar_t*path,Py_ssize_tsize)
{
if (!path[0]||size==0) {
in combination with
path2=_Py_normpath(_Py_join_relfile(path,resolved),-1);

leads to a nullptr dereference.

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    interpreter-core(Objects, Python, Grammar, and Parser dirs)type-bugAn unexpected behavior, bug, or error

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