The TtfUtil:LocaLookup function in TtfUtil.cpp in Libgraphite in
Graphite 2 1.2.4, as used in Mozilla Firefox before 43.0 and Firefox
ESR 38.x before 38.6.1, incorrectly validates a size value, which
allows remote attackers to obtain sensitive information or cause a
denial of service (out-of-bounds read and application crash) via a
crafted Graphite smart font.
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