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ifnet: Fix decreasing the vnet interface count
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Authored by zlei on Mon, Mar 16, 3:44 AM.
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Details

Summary

It should be decreased only when the interface has been successfully
removed from the "active" list.

This prevents vnet_if_return() from potential OOB writes to the
allocated memory "pending".

Fixes: a779388f8bb3 if: Protect V_ifnet in vnet_if_return()
MFC after: 3 days

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rG FreeBSD src repository
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