From patchwork Thu Aug 20 09:20:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265494 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=-9.8 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=ham 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 7EBD0C433E1 for ; Thu, 20 Aug 2020 12:07:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 55E4A207FB for ; Thu, 20 Aug 2020 12:07:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597925259; bh=M6eF5IVhH9pwAY8htjnlrXGIgeElzl0aRUh8Sci0IC8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y1jwCHYppdjbTFwa1nDOaXr7Dvnmo1pTrOgxWw5KagOfpjXHYx1wBbeB4y18Sxylb Kkya1KRyEb4oEjAZ68woeh0SdMUTH173q4VnclQHeexK+bqij9mDJaR6PJiyCIEUU6 gguhq9ypxzABhUXKrpITpXKOsYz8jXjEQcDtWK44= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729748AbgHTMH2 (ORCPT ); Thu, 20 Aug 2020 08:07:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:42646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730402AbgHTJ60 (ORCPT ); Thu, 20 Aug 2020 05:58:26 -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 B6CB72067C; Thu, 20 Aug 2020 09:58:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597917506; bh=M6eF5IVhH9pwAY8htjnlrXGIgeElzl0aRUh8Sci0IC8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MWooHekABzdJuWhhHCyICzo0v0XXAaoPxGOW8I4qasFdpKEzGrLpPMJolAQjaTG3o VAIfafp3WR6z901HQMDMzNEC36rnG+iml5qMIR1J3VniCGa4v5fw6IcZjVxOa7c34X dsraga2TE9vAQPo+RT3rQ9TqOP44CbxnUpZVJJ5w= 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 4.9 054/212] Bluetooth: Fix slab-out-of-bounds read in hci_extended_inquiry_result_evt() Date: Thu, 20 Aug 2020 11:20:27 +0200 Message-Id: <20200820091605.101228298@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200820091602.251285210@linuxfoundation.org> References: <20200820091602.251285210@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 @@ -3826,7 +3826,7 @@ 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))