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Otherwise we can end up comparing the computed digest with an uninitialized kernel buffer. In cryptoaead_op() we already unconditionally fail the request if a pointer to a digest buffer is not specified. Based on a patch by Simran Kathpalia. Reported by: syzkaller Reviewed by: jhb MFC after: 1 week Pull Request: https://github.com/freebsd/freebsd-src/pull/529 Differential Revision: https://reviews.freebsd.org/D32124