Re: [PATCH net v4] net: openvswitch: Fix the dead loop of MPLS parse

[patchwork-bot+netdevbpf@kernel.org]

Hello:

This patch was applied to netdev/net.git (main)
by Paolo Abeni <pabeni@redhat.com>:

On Fri, 23 May 2025 03:41:43 +0000 you wrote:
> The unexpected MPLS packet may not end with the bottom label stack.
> When there are many stacks, The label count value has wrapped around.
> A dead loop occurs, soft lockup/CPU stuck finally.
> 
> stack backtrace:
> UBSAN: array-index-out-of-bounds in /build/linux-0Pa0xK/linux-5.15.0/net/openvswitch/flow.c:662:26
> index -1 is out of range for type '__be32 [3]'
> CPU: 34 PID: 0 Comm: swapper/34 Kdump: loaded Tainted: G           OE   5.15.0-121-generic #131-Ubuntu
> Hardware name: Dell Inc. PowerEdge C6420/0JP9TF, BIOS 2.12.2 07/14/2021
> Call Trace:
>  <IRQ>
>  show_stack+0x52/0x5c
>  dump_stack_lvl+0x4a/0x63
>  dump_stack+0x10/0x16
>  ubsan_epilogue+0x9/0x36
>  __ubsan_handle_out_of_bounds.cold+0x44/0x49
>  key_extract_l3l4+0x82a/0x840 [openvswitch]
>  ? kfree_skbmem+0x52/0xa0
>  key_extract+0x9c/0x2b0 [openvswitch]
>  ovs_flow_key_extract+0x124/0x350 [openvswitch]
>  ovs_vport_receive+0x61/0xd0 [openvswitch]
>  ? kernel_init_free_pages.part.0+0x4a/0x70
>  ? get_page_from_freelist+0x353/0x540
>  netdev_port_receive+0xc4/0x180 [openvswitch]
>  ? netdev_port_receive+0x180/0x180 [openvswitch]
>  netdev_frame_hook+0x1f/0x40 [openvswitch]
>  __netif_receive_skb_core.constprop.0+0x23a/0xf00
>  __netif_receive_skb_list_core+0xfa/0x240
>  netif_receive_skb_list_internal+0x18e/0x2a0
>  napi_complete_done+0x7a/0x1c0
>  bnxt_poll+0x155/0x1c0 [bnxt_en]
>  __napi_poll+0x30/0x180
>  net_rx_action+0x126/0x280
>  ? bnxt_msix+0x67/0x80 [bnxt_en]
>  handle_softirqs+0xda/0x2d0
>  irq_exit_rcu+0x96/0xc0
>  common_interrupt+0x8e/0xa0
>  </IRQ>
> 
> [...]

Here is the summary with links:
  - [net,v4] net: openvswitch: Fix the dead loop of MPLS parse
    https://git.kernel.org/netdev/net/c/0bdc924bfb31

You are awesome, thank you!
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