netmap: harden nmreq option size and overflow checks (defensive)#265

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SORencber wants to merge 1 commit intoopnsense:stable/25.7from

SORencber:harden/netmap-nmreq-size-overflow

Commits on Oct 3, 2025

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