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([2a01:e0a:ab7:2110:6a1d:efff:fe52:1959]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4994a0fc94esm186957915e9.12.2026.08.05.04.58.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 05 Aug 2026 04:58:22 -0700 (PDT) Message-ID: Date: Wed, 5 Aug 2026 13:58:21 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: nicolas.dichtel@6wind.com Subject: Re: [PATCH net v2] ipv6: seg6: clear IPv4 control block in End.DT4 To: David Lee Cc: andrea.mayer@uniroma2.it, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, Kyle Zeng , Dominik 'Disconnect3d' Czarnota , horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260804094625.715305-1-david.lee@trailofbits.com> <519a06fd-c9aa-425b-a374-607aff0a9140@6wind.com> From: Nicolas Dichtel Content-Language: en-US Organization: 6WIND In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Le 05/08/2026 à 12:17, David Lee a écrit : > Hi Nicoals, Hi, please avoid top-posting ;-) https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst#n336 > > You were right. I tested End.DX4 separately on the 62cc90241548 (v7.2-rc5) > kernel and it produced: > > BUG: KASAN: slab-out-of-bounds in __ip_options_echo() > Write of size 255 > > The stack contains both input_action_end_dx4_finish() and > input_action_end_dx4(). A matched bounded control traversed End.DX4, > reached SYN_RECV, and produced no kernel diagnostic. > > Therefore, End.DX4 has the same stale IP6CB-to-IPCB issue. The current > patch only clears IPCB in End.DT4 and is incomplete. > > Do you prefer v3 to be sent out to cover this case too? Yes, it would be nice to fix both in the same time. Regards, Nicolas