netfilter: nf_tables: Fix for duplicate device in netdev hooks

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[ Upstream commit b7cdc5a97d ]

When handling NETDEV_REGISTER notification, duplicate device
registration must be avoided since the device may have been added by
nft_netdev_hook_alloc() already when creating the hook.

Suggested-by: Florian Westphal <fw@strlen.de>
Reported-by: syzbot+bb9127e278fa198e110c@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=bb9127e278fa198e110c
Fixes: a331b78a55 ("netfilter: nf_tables: Respect NETDEV_REGISTER events")
Tested-by: Helen Koike <koike@igalia.com>
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Phil Sutter 2026-03-05 13:01:44 +01:00 • committed by Greg Kroah-Hartman

parent 8a57deeb25

commit 6d2a95c689

2 changed files with 2 additions and 2 deletions

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net/netfilter/nf_tables_api.c

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2

net/netfilter/nft_chain_filter.c

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