From nobody Tue Dec 16 19:58:54 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F2FF5C27C47 for ; Sat, 28 Oct 2023 14:41:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230023AbjJ1Olr (ORCPT ); Sat, 28 Oct 2023 10:41:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229539AbjJ1Olp (ORCPT ); Sat, 28 Oct 2023 10:41:45 -0400 Received: from mail-pl1-x642.google.com (mail-pl1-x642.google.com [IPv6:2607:f8b0:4864:20::642]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3DE12EB; Sat, 28 Oct 2023 07:41:43 -0700 (PDT) Received: by mail-pl1-x642.google.com with SMTP id d9443c01a7336-1cc2f17ab26so6488225ad.0; Sat, 28 Oct 2023 07:41:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1698504103; x=1699108903; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Mogg5X7d2GZ29xgOrb/+nvXHqC0JmhaLIwextb1v/14=; b=IBa6vP9tg1hxRM8oLhJV83O1qsSWxXMyh2OIrwTEx6AfY/vVMxOPAXZnuNfe2iKAb9 Ra1qbqY9ycDRlwGdisGmbVn9RlNdu7cWTpBl85N6PdQv7MLvJbUnOkTTmYkZTti1ZEoA m/tseEEUhIia/dmuF1t2PPuR5FqRuvYpfCo7fVARC3fSCrfTbRjiBn0QNJTOofy224xe evJbH5J+EkF5ezzZAnl2yURr9n5qD/KBIKkaTh8ZgMw/A7dUH2O9/srI5bZ9H7t21MOe +B4LtqX5k/Zj7GaiMwLVbV3MbXpjY60RsfVrJGucbnrMVdT4Y0SWiOy9IyUNy+qG29W9 r5jw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698504103; x=1699108903; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Mogg5X7d2GZ29xgOrb/+nvXHqC0JmhaLIwextb1v/14=; b=kGIdZe1NbmRFoEYqB92oBYV5nTAo0SELrbBePBRnA4/iV8QcEzLs7IyAcAImrXKyNU IxDKqSgSV/OwSA2hzPK7HxTKCMxuUjAhQgS/GfeAz5QDqmyqmUyaoAzQV+Q/qltDydaM fJnp6v9aTS7PANRb5PCEa91ufR4ulUeg3f4PboQZLZGYkmLgz2rhE2j2REMhdZ8C4S2/ 0pZH8d4xmU4pKkSOhMA71oauvdiH7hFfK+aS+7Q+8L3LruQRNMHBMVJZWUSq3C/7eSRy qeC6Choy5pqIomJdnj3xxbQ8UKNI7eNpcYWe5k2olxQVIUK7poWdLxg8mvi5onjkteJl L1+w== X-Gm-Message-State: AOJu0Yx5NsiwWwRosdkFUKzAbfX/rv7JQPTRa3siZQGaFNhd6faikuvi Netr+XZHgAxCucrNiJoRz2s= X-Google-Smtp-Source: AGHT+IE48W7C9EcGBo31JtUbLFJMzB8XIJdO4gsF13JfO+44ruwtMvSCZX/XYHWKHBom5u1Ob8s1sg== X-Received: by 2002:a17:903:3208:b0:1cc:3e45:ac0e with SMTP id s8-20020a170903320800b001cc3e45ac0emr99555plh.69.1698504102629; Sat, 28 Oct 2023 07:41:42 -0700 (PDT) Received: from localhost.localdomain ([27.4.124.129]) by smtp.gmail.com with ESMTPSA id f15-20020a170902ce8f00b001c60a2b5c61sm3302209plg.134.2023.10.28.07.41.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Oct 2023 07:41:42 -0700 (PDT) From: Bragatheswaran Manickavel To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com Cc: Bragatheswaran Manickavel , dccp@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+c71bc336c5061153b502@syzkaller.appspotmail.com Subject: [PATCH net] dccp: check for ccid in ccid_hc_tx_send_packet Date: Sat, 28 Oct 2023 20:11:36 +0530 Message-Id: <20231028144136.3462-1-bragathemanick0908@gmail.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" ccid_hc_tx_send_packet might be called with a NULL ccid pointer leading to a NULL pointer dereference Below mentioned commit has similarly changes commit 276bdb82dedb ("dccp: check ccid before dereferencing") Reported-by: syzbot+c71bc336c5061153b502@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3Dc71bc336c5061153b502 Signed-off-by: Bragatheswaran Manickavel --- net/dccp/ccid.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h index 105f3734dadb..1015dc2b9392 100644 --- a/net/dccp/ccid.h +++ b/net/dccp/ccid.h @@ -163,7 +163,7 @@ static inline int ccid_packet_dequeue_eval(const int re= turn_code) static inline int ccid_hc_tx_send_packet(struct ccid *ccid, struct sock *s= k, struct sk_buff *skb) { - if (ccid->ccid_ops->ccid_hc_tx_send_packet !=3D NULL) + if (ccid !=3D NULL && ccid->ccid_ops->ccid_hc_tx_send_packet !=3D NULL) return ccid->ccid_ops->ccid_hc_tx_send_packet(sk, skb); return CCID_PACKET_SEND_AT_ONCE; } --=20 2.34.1