Re: [PATCH net] ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()

[patchwork-bot+netdevbpf@kernel.org]

Hello:

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

On Wed,  7 Jan 2026 16:31:09 +0000 you wrote:
> Blamed commit did not take care of VLAN encapsulations
> as spotted by syzbot [1].
> 
> Use skb_vlan_inet_prepare() instead of pskb_inet_may_pull().
> 
> [1]
>  BUG: KMSAN: uninit-value in __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
>  BUG: KMSAN: uninit-value in INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
>  BUG: KMSAN: uninit-value in IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321
>   __INET_ECN_decapsulate include/net/inet_ecn.h:253 [inline]
>   INET_ECN_decapsulate include/net/inet_ecn.h:275 [inline]
>   IP6_ECN_decapsulate+0x7a8/0x1fa0 include/net/inet_ecn.h:321
>   ip6ip6_dscp_ecn_decapsulate+0x16f/0x1b0 net/ipv6/ip6_tunnel.c:729
>   __ip6_tnl_rcv+0xed9/0x1b50 net/ipv6/ip6_tunnel.c:860
>   ip6_tnl_rcv+0xc3/0x100 net/ipv6/ip6_tunnel.c:903
>  gre_rcv+0x1529/0x1b90 net/ipv6/ip6_gre.c:-1
>   ip6_protocol_deliver_rcu+0x1c89/0x2c60 net/ipv6/ip6_input.c:438
>   ip6_input_finish+0x1f4/0x4a0 net/ipv6/ip6_input.c:489
>   NF_HOOK include/linux/netfilter.h:318 [inline]
>   ip6_input+0x9c/0x330 net/ipv6/ip6_input.c:500
>   ip6_mc_input+0x7ca/0xc10 net/ipv6/ip6_input.c:590
>   dst_input include/net/dst.h:474 [inline]
>   ip6_rcv_finish+0x958/0x990 net/ipv6/ip6_input.c:79
>   NF_HOOK include/linux/netfilter.h:318 [inline]
>   ipv6_rcv+0xf1/0x3c0 net/ipv6/ip6_input.c:311
>   __netif_receive_skb_one_core net/core/dev.c:6139 [inline]
>   __netif_receive_skb+0x1df/0xac0 net/core/dev.c:6252
>   netif_receive_skb_internal net/core/dev.c:6338 [inline]
>   netif_receive_skb+0x57/0x630 net/core/dev.c:6397
>   tun_rx_batched+0x1df/0x980 drivers/net/tun.c:1485
>   tun_get_user+0x5c0e/0x6c60 drivers/net/tun.c:1953
>   tun_chr_write_iter+0x3e9/0x5c0 drivers/net/tun.c:1999
>   new_sync_write fs/read_write.c:593 [inline]
>   vfs_write+0xbe2/0x15d0 fs/read_write.c:686
>   ksys_write fs/read_write.c:738 [inline]
>   __do_sys_write fs/read_write.c:749 [inline]
>   __se_sys_write fs/read_write.c:746 [inline]
>   __x64_sys_write+0x1fb/0x4d0 fs/read_write.c:746
>   x64_sys_call+0x30ab/0x3e70 arch/x86/include/generated/asm/syscalls_64.h:2
>   do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>   do_syscall_64+0xd3/0xf80 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> 
> [...]

Here is the summary with links:
  - [net] ip6_tunnel: use skb_vlan_inet_prepare() in __ip6_tnl_rcv()
    https://git.kernel.org/netdev/net/c/81c734dae203

You are awesome, thank you!
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