From mboxrd@z Thu Jan 1 00:00:00 1970 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 39A1FC433EF for ; Mon, 28 Feb 2022 17:27:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234194AbiB1R1j (ORCPT ); Mon, 28 Feb 2022 12:27:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44276 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235069AbiB1R1Q (ORCPT ); Mon, 28 Feb 2022 12:27:16 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 21DE1888FC; Mon, 28 Feb 2022 09:26:26 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B046461372; Mon, 28 Feb 2022 17:26:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C6E09C340E7; Mon, 28 Feb 2022 17:26:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1646069185; bh=OKLCEiZwuHmP1wazrd3ezQTU2hh10JgNSBjwTRVn3u4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nTEF6DVNLRB0YlU5OyCZOG061doqyEXo5A8lbVRXc9IaEj5C9mmlPyuqUHQWU3do+ l7dNQvi5cvQOP9WecKuEXRrVnHf7ncD8ddxZk4UJ9uKXltrQLeNyJaLe/LlA6+e26c mtD9zkO2UE377a7G3DCllduWVFynNQ6YB2gCVTmc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum , Grant Grundler , "David S. Miller" Subject: [PATCH 4.9 05/29] sr9700: sanity check for packet length Date: Mon, 28 Feb 2022 18:23:32 +0100 Message-Id: <20220228172142.178460748@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220228172141.744228435@linuxfoundation.org> References: <20220228172141.744228435@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver Neukum commit e9da0b56fe27206b49f39805f7dcda8a89379062 upstream. A malicious device can leak heap data to user space providing bogus frame lengths. Introduce a sanity check. Signed-off-by: Oliver Neukum Reviewed-by: Grant Grundler Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/usb/sr9700.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -409,7 +409,7 @@ static int sr9700_rx_fixup(struct usbnet /* ignore the CRC length */ len = (skb->data[1] | (skb->data[2] << 8)) - 4; - if (len > ETH_FRAME_LEN) + if (len > ETH_FRAME_LEN || len > skb->len) return 0; /* the last packet of current skb */