From: patchwork-bot+netdevbpf@kernel.org
To: Mehul Rao <mehulrao@gmail.com>
Cc: dsahern@kernel.org, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
petrm@nvidia.com, idosch@nvidia.com, netdev@vger.kernel.org,
stable@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH net] net: nexthop: fix percpu use-after-free in remove_nh_grp_entry
Date: Tue, 10 Mar 2026 02:00:09 +0000 [thread overview]
Message-ID: <177310800954.2022132.3786789819097611279.git-patchwork-notify@kernel.org> (raw)
In-Reply-To: <20260306233821.196789-1-mehulrao@gmail.com>
Hello:
This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:
On Fri, 6 Mar 2026 18:38:20 -0500 you wrote:
> When removing a nexthop from a group, remove_nh_grp_entry() publishes
> the new group via rcu_assign_pointer() then immediately frees the
> removed entry's percpu stats with free_percpu(). However, the
> synchronize_net() grace period in the caller remove_nexthop_from_groups()
> runs after the free. RCU readers that entered before the publish still
> see the old group and can dereference the freed stats via
> nh_grp_entry_stats_inc() -> get_cpu_ptr(nhge->stats), causing a
> use-after-free on percpu memory.
>
> [...]
Here is the summary with links:
- [net] net: nexthop: fix percpu use-after-free in remove_nh_grp_entry
https://git.kernel.org/netdev/net/c/b2662e7593e9
You are awesome, thank you!
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prev parent reply other threads:[~2026-03-10 2:00 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-06 23:38 [PATCH net] net: nexthop: fix percpu use-after-free in remove_nh_grp_entry Mehul Rao
2026-03-07 3:30 ` Eric Dumazet
2026-03-08 10:00 ` Ido Schimmel
2026-03-10 2:00 ` patchwork-bot+netdevbpf [this message]
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