From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3FCC7357A26 for ; Tue, 27 Jan 2026 14:44:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769525077; cv=none; b=ZOFn5305LQMWCSFAFJ2Vk8F3nPCajCMghlmQHHgkCkN8q6dgEdkHmGqt/CQqsd46akF6/ZcLGHaw9t0HkaUNXV0qbIzInzzkcs331E0ns1kqCHtimWD6NkbPNThmZH2mV95NfQuVdcmOKunDm+cQxP9k5xRNb7eQ+uE83all8Y8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769525077; c=relaxed/simple; bh=KMVl9/gf9ftHMlrNCaCL/oi8dCNpvpgPzgsVAW/084w=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=CdZS4Qi6BkknlGWmd2zzDkgtMhMputw7DmBuUCrMKbedN2JUGReDCC6cqYsd8aIo735UvJJTv51RpXI7wqA6JJGLed8CfycNFurGS+X/DzvFzeRuRmWQdcn1pWdxcS/RtTJFiM78hmFIgGE5Rpgj8xys8q6ieSIkl990Oge1VNo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=lXN7MZta; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--edumazet.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="lXN7MZta" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-7903fc98229so55283427b3.0 for ; Tue, 27 Jan 2026 06:44:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1769525075; x=1770129875; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=NXsKfDW2pJBcO84KnMkM+kAEFZYrQpwXoj0fFAgFrqc=; b=lXN7MZtaApiLM9RroAKsyilmc9SuYloyjLPdvut2kiGlJkngjTs6SYS8AoxrGG8o6v fZlIzCpzZnVw3onNsewymJnGzuxzkRu9H2btR7mfcQvVJ5LW0TbuN5t+Oiv8j5CVtNVR 633ycW9m1UyAG2RNQMuU6m3/fI3vyohuOOUMYnR9+ifKgifHzpbUy3OJmJpq5kAceOmw p/A9HuoqnJXRQ5W8RsSG4I3cCy22Zp70H1k4pwhb53efbqOOdEzqqSfAxI6bx70emIca b0QuIEHt+DtJQMG3vRDrc1MZxDQE6DCOKTVYYiFdz1PKEeGMzimo3FIOT5sfQzJJn+O8 lmHQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769525075; x=1770129875; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=NXsKfDW2pJBcO84KnMkM+kAEFZYrQpwXoj0fFAgFrqc=; b=Dcs/R66e0jFiMkGZRrQRINn3JqZd7im6NjQVtievRi2IEiRqnrVPu0rC2bM1FbNr9P kPV4RIVWAh1gKJIoCko/7QrDiiBC5n8lW+0WDfBAgbr/Ba/KVYCbCHmvXeFXW5hSYk9G y9bbhbabgO8iHN4uojPjOxiQxdarn+9/GyQwpmW51uu5ao67pjP0UxJ60gg8Nx0JFm6k kUoLtxLzq2FtQlA30uA2I+8NrMsEFkRNUZDdH5C1GahLQu3poEkTPHyfgHJDLXnCHjcJ 9m5rMY0bYvLsM+GZYQIEstBENZ+Ef2ApXShI1efLr9KtubarkJE4rd48zY2SoN1f4VF0 Rnww== X-Forwarded-Encrypted: i=1; AJvYcCVC734T12FJkOsPs+LDEUqJVK2GpuEgd63cw7jCb3egzD4IElEIaiBLZyfr5jhJQQzHUezV/yM=@vger.kernel.org X-Gm-Message-State: AOJu0Yxx+wG/f4XSD4EtWzzbxM2o9cLnL6CMfIZQvXfBQFQQ+RihxbZ4 XUamILvvzeVdCBWL3DnRXlKM6uLksUpDBh6w/ePEjkMelRMwIPSgnbt2iTwPFYyX3h7wPck+yf2 6hr4+M6GYm+QW2w== X-Received: from yxk16.prod.google.com ([2002:a05:690e:6d0:b0:644:5de0:129a]) (user=edumazet job=prod-delivery.src-stubby-dispatcher) by 2002:a05:690e:344:b0:649:3f2e:5285 with SMTP id 956f58d0204a3-6498fc9fdbamr939978d50.90.1769525075260; Tue, 27 Jan 2026 06:44:35 -0800 (PST) Date: Tue, 27 Jan 2026 14:44:31 +0000 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.53.0.rc1.217.geba53bf80e-goog Message-ID: <20260127144433.196836-1-edumazet@google.com> Subject: [PATCH net 0/2] net: fix potential crash in net/sched/cls_u32.c From: Eric Dumazet To: "David S . Miller" , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Jamal Hadi Salim , Cong Wang , Jiri Pirko , GangMin Kim , netdev@vger.kernel.org, eric.dumazet@gmail.com, Eric Dumazet Content-Type: text/plain; charset="UTF-8" GangMin Kim provided a report and a repro fooling u32_classify(). Add skb_header_pointer_careful() variant of skb_header_pointer() and use it in net/sched/cls_u32.c. Later we can also use it in net/sched/act_pedit.c Eric Dumazet (2): net: add skb_header_pointer_careful() helper net/sched: cls_u32: use skb_header_pointer_careful() include/linux/skbuff.h | 12 ++++++++++++ net/sched/cls_u32.c | 13 ++++++------- 2 files changed, 18 insertions(+), 7 deletions(-) -- 2.53.0.rc1.217.geba53bf80e-goog