Re: [PATCH net-next] ipv6: guard ip6_mr_output() with rcu

[patchwork-bot+netdevbpf@kernel.org]

Hello:

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

On Fri, 27 Jun 2025 11:58:21 +0000 you wrote:
> syzbot found at least one path leads to an ip_mr_output()
> without RCU being held.
> 
> Add guard(rcu)() to fix this in a concise way.
> 
> WARNING: net/ipv6/ip6mr.c:2376 at ip6_mr_output+0xe0b/0x1040 net/ipv6/ip6mr.c:2376, CPU#1: kworker/1:2/121
> Call Trace:
>  <TASK>
>   ip6tunnel_xmit include/net/ip6_tunnel.h:162 [inline]
>   udp_tunnel6_xmit_skb+0x640/0xad0 net/ipv6/ip6_udp_tunnel.c:112
>   send6+0x5ac/0x8d0 drivers/net/wireguard/socket.c:152
>   wg_socket_send_skb_to_peer+0x111/0x1d0 drivers/net/wireguard/socket.c:178
>   wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline]
>   wg_packet_tx_worker+0x1c8/0x7c0 drivers/net/wireguard/send.c:276
>   process_one_work kernel/workqueue.c:3239 [inline]
>   process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322
>   worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403
>   kthread+0x70e/0x8a0 kernel/kthread.c:464
>   ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
>   ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
> 
> [...]

Here is the summary with links:
  - [net-next] ipv6: guard ip6_mr_output() with rcu
    https://git.kernel.org/netdev/net-next/c/af232e7615e4

You are awesome, thank you!
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