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Mon, 02 Nov 2026 08:18:52 -0800 (PST) Received: from localhost ([153.61.198.248]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8aad9d03424sm2308383b3a.24.2026.11.02.08.18.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Nov 2026 08:18:51 -0800 (PST) Content-Type: text/plain; charset=UTF-8 Date: Mon, 02 Nov 2026 16:18:50 +0000 Message-Id: Cc: , , , , , , , , , , , , , , , , Subject: Re: [PATCH bpf v2 07/15] bpf, sockmap: Check the target of an egress redirect before each send From: "Alexei Starovoitov" To: "Jiayuan Chen" , , In-Reply-To: <69e66c9c-f2ab-41a7-972d-d1562a6387b8@linux.dev> References: <20261102072112.4160195-1-alexei.starovoitov@gmail.com> <20261102072112.4160195-8-alexei.starovoitov@gmail.com> <69e66c9c-f2ab-41a7-972d-d1562a6387b8@linux.dev> Content-Transfer-Encoding: 8bit X-Mailing-List: mptcp@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 On Mon, Nov 02, 2026 at 04:32 AM Jiayuan Chen wrote: > I can trigger it by redirecting data to a non-accept sk. > > ================================================================== > BUG: KASAN: null-ptr-deref in tcp_sendmsg_locked+0xfb8/0x4550 > Write of size 8 at addr 0000000000000008 by task repro/488 Thanks for testing. All patches have reproducers. I didn't share them, hough it's a weak defense. Anyone can build a repro from the patch.