expat: fix CVE-2021-46143
In doProlog in xmlparse.c in Expat (aka libexpat) before 2.4.3, an integer overflow exists for m_groupSize. Backport patch from: https://github.com/libexpat/libexpat/pull/538/commits/85ae9a2d7d0e9358f356b33977b842df8ebaec2b CVE: CVE-2021-46143 Signed-off-by:Steve Sakoman <steve@sakoman.com>
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