From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DE1F1392831; Thu, 30 Jul 2026 15:08:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785424106; cv=none; b=bJx2/v8fulxZ8rk58YKiPDiWphtcM/jBv+UIXAyXaEkvbxhAvDOFCy0+RfWViNnBNDtVAkHmdT4SjS9HwaRIT9nmV9Sdvbni19XNr/dr/2K/u4m5jueFCx35JMis4u34xPzKpHx1ixnuqoMrCE6spnl1JOjYim/7kK794asm8CU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785424106; c=relaxed/simple; bh=c2j1MIXA7QqyW8HxF08sjBlVJM2s7cBUdKyWOdBm67A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PxsAjY2g6uh8onWY/Reem3V9Dh6AV+GT6rFP6ibAc+1W4AxVV+P9XwOn1WX+73egOlQIP0hzGD2Ht5aYngdd94M4JsMhqf9fL/MQ4FbAiQ5w4x0Hv9IOynyNzHrapDz1eSZW7a13tmcVHoa4DRL1LyhuikXRzCjOh3GKUa3fxx0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iAXcD721; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iAXcD721" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4566D1F000E9; Thu, 30 Jul 2026 15:08:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1785424104; bh=ZZNnkYzudfrM2+mW5LCpSnhuLj1QoaeAR1Dzzab32BU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=iAXcD721MCPCEJtYIXDuzUg6qQmZE+5/eolJ+e4uLVys17epPErSaB+sxX5KRx/24 F9vozDgLv+Fv5QsZjtwJygjSJLdqMKIucPFys6g7UtgrxDfQ94HV+KyzQqNDo7Nvw9 31XG/hrdcMyoKsnziEK6oW3laQFVeqPxYQGnpUVA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qing Luo , Xin Long , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.18 278/675] sctp: auth: verify auth requirement when auth_chunk is NULL Date: Thu, 30 Jul 2026 16:10:08 +0200 Message-ID: <20260730141451.034082720@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260730141445.110192266@linuxfoundation.org> References: <20260730141445.110192266@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Qing Luo [ Upstream commit 8e04823c120b376ef7dab14b60ebf6823aa16c14 ] sctp_auth_chunk_verify() returns true unconditionally when chunk->auth_chunk is NULL, silently skipping authentication. This is incorrect when: 1. skb_clone() failed in the BH receive path, leaving auth_chunk NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new connections, so the early sctp_auth_recv_cid() check cannot catch this. 2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never called and auth_chunk remains NULL. Fix by checking sctp_auth_recv_cid() when auth_chunk is NULL: if authentication is required, return false to drop the chunk; otherwise continue normally. Fixes: bbd0d59809f9 ("[SCTP]: Implement the receive and verification of AUTH chunk") Signed-off-by: Qing Luo Acked-by: Xin Long Link: https://patch.msgid.link/20260721015532.120157-2-l1138897701@163.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/sctp/sm_statefuns.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index abfd72d1f20c64..4b8d48b6706c85 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -641,7 +641,7 @@ static bool sctp_auth_chunk_verify(struct net *net, struct sctp_chunk *chunk, struct sctp_chunk auth; if (!chunk->auth_chunk) - return true; + return !sctp_auth_recv_cid(chunk->chunk_hdr->type, asoc); /* SCTP-AUTH: auth_chunk pointer is only set when the cookie-echo * is supposed to be authenticated and we have to do delayed -- 2.53.0