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Subject: Re: [PATCH net 1/2] nexthop: take nh->lock for f6i_list walks in
 replace
 check and notify
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <178493102203.3330129.7311134539620710020.git-patchwork-notify@kernel.org>
Date: Fri, 24 Jul 2026 22:10:22 +0000
References: <20260722002951.2614721-1-xmei5@asu.edu>
In-Reply-To: <20260722002951.2614721-1-xmei5@asu.edu>
To: Xiang Mei (Microsoft) <xmei5@asu.edu>
Cc: dsahern@kernel.org, idosch@nvidia.com, davem@davemloft.net,
 edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org,
 kuniyu@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
 AutonomousCodeSecurity@microsoft.com, tgopinath@linux.microsoft.com,
 kys@microsoft.com

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 22 Jul 2026 00:29:50 +0000 you wrote:
> fib6_check_nh_list() and __nexthop_replace_notify() walk nh->f6i_list
> during an RTNL-serialized nexthop replace without holding nh->lock. IPv6
> RTM_NEWROUTE/RTM_DELROUTE run without RTNL and mutate that list under
> nh->lock (fib6_add_rt2node_nh(), fib6_purge_rt()), so both walks race a
> concurrent route delete that unlinks and frees a fib6_info:
> 
>   BUG: KASAN: slab-use-after-free in rt6_fill_node.isra.0 (net/ipv6/route.c:5799)
>   Read of size 4 at addr ffff888014607e64 by task exploit/143
>    rt6_fill_node.isra.0 (net/ipv6/route.c:5799)
>    fib6_rt_update (net/ipv6/route.c:6412)
>    __nexthop_replace_notify (net/ipv4/nexthop.c:2542)
>    rtm_new_nexthop (net/ipv4/nexthop.c:2554)
>    rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)
> 
> [...]

Here is the summary with links:
  - [net,1/2] nexthop: take nh->lock for f6i_list walks in replace check and notify
    https://git.kernel.org/netdev/net/c/072cd1f21819
  - [net,2/2] nexthop: avoid unlocked f6i_list walk in nh_rt_cache_flush
    https://git.kernel.org/netdev/net/c/4787a6d2629b

You are awesome, thank you!
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