ifnet: if_vmove_reclaim(): Be more robust to check the src / dst vnet
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Authored by zlei on Mar 17 2026, 4:56 PM.

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glebius

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network

Summary

The ifp is only weak referenced, if_vmove_reclaim() may race with other
threads' if_vmove() or if_detach(), hence ifp->if_vnet is not safe nor
stable to access. Given we know the source and destination prison/vnet,
check them instead.

MFC after: 2 weeks

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rG FreeBSD src repository

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zlei created this revision.Mar 17 2026, 4:56 PM

Herald added subscribers: melifaro, ae, imp. · View Herald TranscriptMar 17 2026, 4:56 PM

zlei requested review of this revision.Mar 17 2026, 4:56 PM

zlei mentioned this in D55832: ifnet: if_vmove_(loan|reclaim): Refactor a bit the checking of src / dst vnet.

zlei abandoned this revision.Mar 20 2026, 6:56 PM

zlei added inline comments.

sys/net/if.c
1286	This assert is wrong. Post fix to D55997.

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if.c

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ifnet: if_vmove_reclaim(): Be more robust to check the src / dst vnetAbandonedPublicActions