adfe2f6aff
These ioctls can process a number of items at a time, which puts us at risk of overflow in mallocarray() and of impossibly large allocations even if we don't overflow. Limit the allocation to required size (or the user allocation, if that's smaller). That does mean we need to do the allocation with the rules lock held (so the number doesn't change while we're doing this), so it can't M_WAITOK. MFC after: 1 week
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