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This addresses a bug in the addition overflow check added in commit319414a926("netmap: Handle overflow when computing ring sizes"): that overflow wasn't actually caught by the check because "len" is promoted to size_t. PR: 297300 Fixes:319414a926("netmap: Handle overflow when computing ring sizes") Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D58896