Merge branch 'bridge-vxlan-fix-reading-neigh-ha-without-synchronization'

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Nikolay Aleksandrov says:

====================
bridge/vxlan: fix reading neigh ha without synchronization

Neigh ha address must be read using the seqlock to get a stable snapshot.
Both the bridge and vxlan read it directly and can see partial updates.
I reproduced both issues with running neigh updates and exercising these
paths in parallel and saw partial addresses, e.g. updating between
neigh A: 02:00:00:00:00:00 neigh B: fe:ff:ff:ff:ff:ff was able to observe
02:00:ff:ff:ff:ff and fe:ff:00:00:00:00 in packets. Noticed this initially
in the bridge, then checked vxlan and its arp/neigh_reduce functions have
the same bug, route_shortcircuit is doing the right thing already.
====================

Link: https://patch.msgid.link/20260818150756.890025-1-razor@blackwall.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Kicinski 2026-08-20 14:23:07 -07:00

parent 5ee0ceddc7 b824059a67

commit e264c04870

2 changed files with 27 additions and 17 deletions

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20

drivers/net/vxlan/vxlan_core.c

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24

net/bridge/br_arp_nd_proxy.c

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