Endless Recursion Vulnerability in xkbcommon and libxkbcommon

CVE-2018-15853

Endless recursion exists in xkbcomp/expr.c in xkbcommon and libxkbcommon before 0.8.1, which could be used by local attackers to crash xkbcommon users by supplying a crafted keymap file that triggers boolean negation.

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