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 15F7F43231F; Mon, 17 Aug 2026 15:20:22 +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=1786980024; cv=none; b=CxK1hPyKW0cSTBDetphyplqyt8qLTR7BFijwh2IoijTB5BKWIVW1QjLU13x+rjmGQ7o41hKKe9/KFTKuSO6MfMPIv7It0URDlB9q2oy3S+9UZ0Yumz7WLQ0OWzbzccmmUCnfiqR6xoqljWS9hQPtrqW2taaaSsZN3AKQCQjflRw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786980024; c=relaxed/simple; bh=E2f9ckRkUX9TMhvjipjSyITz4iNwLy+0eY5eFmtg5Ww=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tLjpLiFk9751NySHRrbtfnpCN0NevttoZhb9fELXG0YhSXx3IqMYra0xyk1aWPN4TwWewGy4qqMvDCoG+bW+Eq45vB+OFqCbf40cLtnMQ/1NGPFN5EHzxMjQD1I2xtKvwNA0ayIlFmotM2bRPxRB5QY38nlbWTBIiLgNyNArYh8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FotPRcTV; 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="FotPRcTV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20C5F1F000E9; Mon, 17 Aug 2026 15:20:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786980022; bh=YhkVWhbbXA0F9ie7dPGadC38kkJkSzSpotcdX6dCicg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FotPRcTVVzDzH10SSxZ+xlViD86YyCkJBpck+YsiPLdOCZmM6vFWNh1KyGszdQDtH aUjNAtj8h2fE//P4OGeDCOwRj/SytFjLzjvdzxKK/vnnXLpdgoBg+SL6DCc24RkPtb Bs7RxGNB0CXNLH8SJV4bQUmvSyOH+O92fwoeIUs8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Asim Viladi Oglu Manizada , Xin Long , Jakub Kicinski Subject: [PATCH 6.1 429/609] sctp: prevent peer transport count overflow Date: Mon, 17 Aug 2026 15:32:05 +0200 Message-ID: <20260817132558.445642616@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132543.039278408@linuxfoundation.org> References: <20260817132543.039278408@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 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Asim Viladi Oglu Manizada commit bd0e9289e2642f6a5c54faad304ce0f41e926d22 upstream. sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit. Fixes: 8f840e47f190 ("sctp: add the sctp_diag.c file") Cc: stable@vger.kernel.org Signed-off-by: Asim Viladi Oglu Manizada Acked-by: Xin Long Link: https://patch.msgid.link/20260725032053.521705-1-manizada@pm.me Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- net/sctp/associola.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -616,6 +616,9 @@ struct sctp_transport *sctp_assoc_add_pe return peer; } + if (asoc->peer.transport_count == U16_MAX) + return NULL; + peer = sctp_transport_new(asoc->base.net, addr, gfp); if (!peer) return NULL;