ipvs: do not keep dest_dst if dev is going down

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[ Upstream commit 8fde939b02 ]

There is race between the netdev notifier ip_vs_dst_event()
and the code that caches dst with dev that is going down.
As the FIB can be notified for the closed device after our
handler finishes, it is possible valid route to be returned
and cached resuling in a leaked dev reference until the dest
is not removed.

To prevent new dest_dst to be attached to dest just after the
handler dropped the old one, add a netif_running() check
to make sure the notifier handler is not currently running
for device that is closing.

Fixes: 7a4f0761fc ("IPVS: init and cleanup restructuring")
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Julian Anastasov 2026-02-14 16:58:50 +02:00 • committed by Greg Kroah-Hartman

parent 9a6b2ba736

commit bae53b3baf

1 changed files with 36 additions and 10 deletions

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net/netfilter/ipvs/ip_vs_xmit.c

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