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Add more validity checks at policy load time to reject malformed policies and prevent subsequent out-of-range indexing when in permissive mode. Resolves the NULL pointer dereference reported in https://bugzilla.redhat.com/show_bug.cgi?id=357541. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>