Lorenzo Bianconi b2870fc216 netfilter: br_netfilter: Reallocate headroom if necessary in neigh_hh_bridge()
neigh_hh_bridge() assumes the skb always has sufficient headroom to copy
the aligned  L2 header. This assumption can trigger the crash reported
below using the following netfilter setup:

$modprobe br_netfilter
$sysctl -w net.bridge.bridge-nf-call-iptables=1

$root@OpenWrt:~# nft list ruleset
table ip nat {
        chain prerouting {
                type nat hook prerouting priority dstnat; policy accept;
                ip daddr 192.168.83.123 dnat to 192.168.83.120
        }
}

- iperf3 client (192.168.83.119) --> bridge (192.168.83.118) --> iperf3 server (192.168.83.120)

the iperf3 client is sending packet for 192.168.83.123 to the bridge device.

[ 1579.036575] Unable to handle kernel write to read-only memory at virtual address ffffff8004d76ffe
[ 1579.045482] Mem abort info:
[ 1579.048273]   ESR = 0x000000009600004f
[ 1579.052024]   EC = 0x25: DABT (current EL), IL = 32 bits
[ 1579.057363]   SET = 0, FnV = 0
[ 1579.060417]   EA = 0, S1PTW = 0
[ 1579.063550]   FSC = 0x0f: level 3 permission fault
[ 1579.068345] Data abort info:
[ 1579.071224]   ISV = 0, ISS = 0x0000004f, ISS2 = 0x00000000
[ 1579.076720]   CM = 0, WnR = 1, TnD = 0, TagAccess = 0
[ 1579.081770]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 1579.087092] swapper pgtable: 4k pages, 39-bit VAs, pgdp=0000000080dc4000
[ 1579.093794] [ffffff8004d76ffe] pgd=180000009ffff003, p4d=180000009ffff003, pud=180000009ffff003, pmd=180000009ffe3003, pte=0060000084d76787
[ 1579.106343] Internal error: Oops: 000000009600004f [#1] SMP
[ 1579.193824] CPU: 0 UID: 0 PID: 235 Comm: napi/qdma_eth-3 Tainted: G           O       6.12.57 #0
[ 1579.202614] Tainted: [O]=OOT_MODULE
[ 1579.206102] Hardware name: Airoha AN7581 Evaluation Board (DT)
[ 1579.211929] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 1579.218889] pc : br_nf_pre_routing_finish_bridge+0x1ac/0xcc8 [br_netfilter]
[ 1579.225859] lr : br_nf_pre_routing_finish_bridge+0x18c/0xcc8 [br_netfilter]
[ 1579.232822] sp : ffffffc0817cba20
[ 1579.236128] x29: ffffffc0817cba20 x28: 0000000000000000 x27: ffffff8002b89000
[ 1579.243273] x26: ffffff8004d7700e x25: 0000000000000008 x24: 0000000000000000
[ 1579.250416] x23: ffffffc08179d4c0 x22: 0000000000000000 x21: ffffffc08179d4c0
[ 1579.257561] x20: ffffff8004d9b800 x19: ffffff8015010000 x18: 0000000000000014
[ 1579.264704] x17: ffffffbf9e930000 x16: ffffffc0817c8000 x15: 0000000000000070
[ 1579.271848] x14: 0000000000000080 x13: 0000000000000001 x12: 0000000000000000
[ 1579.278993] x11: ffffffc0798caae0 x10: ffffff8014db6fd8 x9 : 0000000000000000
[ 1579.286136] x8 : 0000000000000003 x7 : ffffffc08171f628 x6 : 000000001a3b83d3
[ 1579.293281] x5 : 0000000000000000 x4 : 1beb76f22fee0000 x3 : ffffff8004d7700e
[ 1579.300425] x2 : 0000000000000000 x1 : ffffff8004d9b8bc x0 : ffffff80026ed000
[ 1579.307570] Call trace:
[ 1579.310018]  br_nf_pre_routing_finish_bridge+0x1ac/0xcc8 [br_netfilter]
[ 1579.316632]  br_nf_hook_thresh+0xd4/0x14bc [br_netfilter]
[ 1579.322032]  br_nf_hook_thresh+0x250/0x14bc [br_netfilter]
[ 1579.327517]  br_nf_hook_thresh+0x76c/0x14bc [br_netfilter]
[ 1579.333003]  br_handle_frame+0x180/0x480
[ 1579.336935]  __netif_receive_skb_core.constprop.0+0x540/0xf40
[ 1579.342682]  __netif_receive_skb_one_core+0x28/0x50
[ 1579.347561]  process_backlog+0x98/0x1e0
[ 1579.351398]  __napi_poll+0x34/0x1c4
[ 1579.354887]  net_rx_action+0x178/0x330
[ 1579.358638]  handle_softirqs+0x108/0x2d4
[ 1579.362560]  __do_softirq+0x10/0x18
[ 1579.366051]  ____do_softirq+0xc/0x20
[ 1579.369627]  call_on_irq_stack+0x30/0x4c
[ 1579.373550]  do_softirq_own_stack+0x18/0x20
[ 1579.377734]  do_softirq+0x4c/0x60
[ 1579.381050]  __local_bh_enable_ip+0x88/0x98
[ 1579.385234]  napi_threaded_poll_loop+0x188/0x21c
[ 1579.389853]  napi_threaded_poll+0x70/0x80
[ 1579.393863]  kthread+0xd8/0xdc
[ 1579.396918]  ret_from_fork+0x10/0x20
[ 1579.400499] Code: 88dffc22 3707ffc2 f9406663 f9406684 (f81f0064)
[ 1579.406589] ---[ end trace 0000000000000000 ]---
[ 1579.411209] Kernel panic - not syncing: Oops: Fatal exception in interrupt
[ 1579.418083] SMP: stopping secondary CPUs
[ 1579.422012] Kernel Offset: disabled

Fix the issue reallocating the skb headroom if necessary in neigh_hh_bridge routine.

Fixes: e179e6322a ("netfilter: bridge-netfilter: Fix MAC header handling with IP DNAT")
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2026-05-16 13:22:50 +02:00
2026-04-28 18:13:58 -04:00
2026-01-26 19:07:09 -08:00
2022-09-28 09:02:20 +02:00
2025-02-19 14:53:27 -07:00
2026-05-03 14:21:25 -07:00

Linux kernel
============

The Linux kernel is the core of any Linux operating system. It manages hardware,
system resources, and provides the fundamental services for all other software.

Quick Start
-----------

* Report a bug: See Documentation/admin-guide/reporting-issues.rst
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Essential Documentation
-----------------------

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* Building requirements: Documentation/process/changes.rst
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============

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For Specific Users
==================

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--------------------

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-------------------

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* Researcher Guidelines: Documentation/process/researcher-guidelines.rst
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---------------

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-----------------------------

Maintain and stabilize kernel versions:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* Backporting Guide: Documentation/process/backporting.rst
* Applying Patches: Documentation/process/applying-patches.rst
* Subsystem Profile: Documentation/maintainer/maintainer-entry-profile.rst
* Git for Maintainers: Documentation/maintainer/configure-git.rst

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--------------------

Configure, tune, and troubleshoot Linux systems:

* Admin Guide: Documentation/admin-guide/index.rst
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* Sysctl Tuning: Documentation/admin-guide/sysctl/index.rst
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----------

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* Maintainer Handbook: Documentation/maintainer/index.rst
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---------------

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* Driver API Guide: Documentation/driver-api/index.rst
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* Power Management: Documentation/driver-api/pm/index.rst
* DMA API: Documentation/core-api/dma-api.rst

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-----------------------

Package and distribute the kernel:

* Stable Kernel Rules: Documentation/process/stable-kernel-rules.rst
* ABI Documentation: Documentation/ABI/README
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-------------------

CRITICAL: If you are an LLM or AI-powered coding assistant, you MUST read and
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This documentation contains essential requirements about licensing, attribution,
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=========================

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