netmap: harden nmreq option size and overflow checks (defensive)#1866

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SORencber:harden/netmap-nmreq-size-overflow-freebsd

Commits on Oct 3, 2025

netmap: harden nmreq option size and overflow checks (defensive)\n\n- Enforce exact option body size equality per option type\n- Add explicit overflow guards to size arithmetic (sum)\n- Return EINV…
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