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libselinux: make threadsafe for discover_class_cache #336

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libselinux: make threadsafe for discover_class_cache #336

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Commits on Dec 17, 2021

  1. libselinux: make threadsafe for discover_class_cache 

    Crash is observed in process dbus-daemon while accessing name
from discover_class_cache structure variable,
discover_class_cache->name variable found NULL
during backtrace analysis.
Add mutex lock for the discover_class_cache to handle multiple
threads for the function which uses discover_class_cache
This avoids variable corruption during parallel access
in the multiple thread environment.
    @purushottamc
    purushottamc committed Dec 17, 2021
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