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bpo-46208: Fix normalization of relative paths in _Py_normpath()/os.path.normpath (GH-30362)

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neonene 2022-01-07 04:13:10 +09:00 • committed by GitHub
parent 9925e70e48
commit 9c5fa9c97c
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4 changed files with 43 additions and 9 deletions
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25
Python/fileutils.c
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@ -2218,11 +2218,11 @@ _Py_normpath(wchar_t *path, Py_ssize_t size)
if (!path[0] || size == 0) {
return path;
}
wchar_t lastC = L'\0';
wchar_t *p1 = path;
wchar_t *pEnd = size >= 0 ? &path[size] : NULL;
wchar_t *p2 = path;
wchar_t *minP2 = path;
wchar_t *p1 = path; // sequentially scanned address in the path
wchar_t *p2 = path; // destination of a scanned character to be ljusted
wchar_t *minP2 = path; // the beginning of the destination range
wchar_t lastC = L'\0'; // the last ljusted character, p2[-1] in most cases
#define IS_END(x) (pEnd ? (x) == pEnd : !*(x))
#ifdef ALTSEP
@ -2264,14 +2264,18 @@ _Py_normpath(wchar_t *path, Py_ssize_t size)
*p2++ = lastC = *p1;
}
}
minP2 = p2;
if (sepCount) {
minP2 = p2; // Invalid path
} else {
minP2 = p2 - 1; // Absolute path has SEP at minP2
}
}
#else
// Skip past two leading SEPs
else if (IS_SEP(&p1[0]) && IS_SEP(&p1[1]) && !IS_SEP(&p1[2])) {
*p2++ = *p1++;
*p2++ = *p1++;
minP2 = p2;
minP2 = p2 - 1; // Absolute path has SEP at minP2
lastC = SEP;
}
#endif /* MS_WINDOWS */
@ -2292,8 +2296,11 @@ _Py_normpath(wchar_t *path, Py_ssize_t size)
wchar_t *p3 = p2;
while (p3 != minP2 && *--p3 == SEP) { }
while (p3 != minP2 && *(p3 - 1) != SEP) { --p3; }
if (p3[0] == L'.' && p3[1] == L'.' && IS_SEP(&p3[2])) {
// Previous segment is also ../, so append instead
if (p2 == minP2
|| (p3[0] == L'.' && p3[1] == L'.' && IS_SEP(&p3[2])))
{
// Previous segment is also ../, so append instead.
// Relative path does not absorb ../ at minP2 as well.
*p2++ = L'.';
*p2++ = L'.';
lastC = L'.';
@ -2314,7 +2321,7 @@ _Py_normpath(wchar_t *path, Py_ssize_t size)
}
} else {
*p2++ = lastC = c;
}
}
}
*p2 = L'\0';
if (p2 != minP2) {