From patchwork Mon Aug 10 15:21:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 266655 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A501C433DF for ; Mon, 10 Aug 2020 15:32:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2801207FF for ; Mon, 10 Aug 2020 15:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597073577; bh=kBMYDFhRnChutM/t5d6Xdcinvd6tqSpoUz7KNV5h4G0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=aQS+FGPaX5smWIXpeVGuuq9b+2v1X7NHkGRAXc0AihkZOkgOyFj6dsIfMO74sRkOs M6P2QAJE/x+nGnyL3jy/j5Urhe00OMJQLaIbh6b2Pi95FwcRS77wRew7LApIzjJP0L fu+TQU5fU/f9sFqenjLQCs0NpWOjsWk1zGY1xPPM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729054AbgHJPaG (ORCPT ); Mon, 10 Aug 2020 11:30:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:36804 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729048AbgHJPaF (ORCPT ); Mon, 10 Aug 2020 11:30:05 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 609D022D08; Mon, 10 Aug 2020 15:30:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597073404; bh=kBMYDFhRnChutM/t5d6Xdcinvd6tqSpoUz7KNV5h4G0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AIAK9XlJbOSJjykCdMIKxjl21muabZUWXBn31Bkas2Cg//w+CFLltJ9hbel6NpwB3 ctF1PQm152yjaxP0XzY4VhtwvJjlbGnUpy0Gq+sQMJItHpjhcvQc66seUTOKElpZEs zp48D/dvNtkgoGgKesi2ryHPn9CCQm4FMtfhCpJE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+d8489a79b781849b9c46@syzkaller.appspotmail.com, Peilin Ye , Marcel Holtmann Subject: [PATCH 4.19 08/48] Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() Date: Mon, 10 Aug 2020 17:21:30 +0200 Message-Id: <20200810151804.617146256@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200810151804.199494191@linuxfoundation.org> References: <20200810151804.199494191@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Peilin Ye commit 51c19bf3d5cfaa66571e4b88ba2a6f6295311101 upstream. Check upon `num_rsp` is insufficient. A malformed event packet with a large `num_rsp` number makes hci_extended_inquiry_result_evt() go out of bounds. Fix it. This patch fixes the following syzbot bug: https://syzkaller.appspot.com/bug?id=4bf11aa05c4ca51ce0df86e500fce486552dc8d2 Reported-by: syzbot+d8489a79b781849b9c46@syzkaller.appspotmail.com Cc: stable@vger.kernel.org Signed-off-by: Peilin Ye Acked-by: Greg Kroah-Hartman Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hci_event.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -4151,7 +4151,7 @@ static void hci_extended_inquiry_result_ BT_DBG("%s num_rsp %d", hdev->name, num_rsp); - if (!num_rsp) + if (!num_rsp || skb->len < num_rsp * sizeof(*info) + 1) return; if (hci_dev_test_flag(hdev, HCI_PERIODIC_INQ))