[3.11] gh-133767: Fix use-after-free in the unicode-escape decoder with an error handler (GH-129648) (GH-133944) #134341
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…der with an error handler (pythonGH-129648) (pythonGH-133944) If the error handler is used, a new bytes object is created to set as the object attribute of UnicodeDecodeError, and that bytes object then replaces the original data. A pointer to the decoded data will became invalid after destroying that temporary bytes object. So we need other way to return the first invalid escape from _PyUnicode_DecodeUnicodeEscapeInternal(). _PyBytes_DecodeEscape() does not have such issue, because it does not use the error handlers registry, but it should be changed for compatibility with _PyUnicode_DecodeUnicodeEscapeInternal(). (cherry picked from commit 9f69a58) (cherry picked from commit 6279eb8) (cherry picked from commit a75953b) Co-authored-by: Serhiy Storchaka <[email protected]>
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Reference: python/cpython#134341 PR: 287009
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Reference: python/cpython#134341 PR: 287009
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Reference: python/cpython#134341 PR: 287009 (cherry picked from commit 5e57ff8)
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If the error handler is used, a new bytes object is created to set as the object attribute of UnicodeDecodeError, and that bytes object then replaces the original data. A pointer to the decoded data will became invalid after destroying that temporary bytes object. So we need other way to return the first invalid escape from _PyUnicode_DecodeUnicodeEscapeInternal().
_PyBytes_DecodeEscape() does not have such issue, because it does not use the error handlers registry, but it should be changed for compatibility with _PyUnicode_DecodeUnicodeEscapeInternal().
(cherry picked from commit 9f69a58) (cherry picked from commit 6279eb8) (cherry picked from commit a75953b)
unicode_escapedecoder with error handler #133767