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CVE-2022-40674: Ensure raw tagnames are safe exiting internalEntityParser by RMJ10 · Pull Request #629 · libexpat/libexpat
libexpat before 2.4.9 has a use-after-free in the doContent function in xmlparse.c.
It is possible to concoct a situation in which parsing is suspended while substituting in an internal entity, so that XML_ResumeParser directly uses internalEntityProcessor as its processor. If the subsequent parse includes some unclosed tags, this will return without calling storeRawNames to ensure that the raw versions of the tag names are stored in memory other than the parse buffer itself. If the parse buffer is then changed or reallocated (for example if processing a file line by line), badness will ensue.
This patch ensures storeRawNames is always called when needed after calling doContent. The earlier call do doContent does not need the same protection; it only deals with entity substitution, which cannot leave unbalanced tags, and in any case the raw names will be pointing into the stored entity value not the parse buffer.
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