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 X-Spam-Level: X-Spam-Status: No, score=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_RED, 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 25362C433E6 for ; Mon, 28 Dec 2020 13:43:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E3EBA207B2 for ; Mon, 28 Dec 2020 13:43:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404326AbgL1Nmw (ORCPT ); Mon, 28 Dec 2020 08:42:52 -0500 Received: from mail.kernel.org ([198.145.29.99]:43244 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404293AbgL1Nms (ORCPT ); Mon, 28 Dec 2020 08:42:48 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id C30EC207B2; Mon, 28 Dec 2020 13:42:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609162928; bh=AA3haTdH1w4Ov9q+j6FSzx33aczdJCdZSJ/z+D8vm4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kKHen2YrkLvVy5HFYGDEzOq3FIl3EcqFv2+OvNj57q7LD+G2GEKjn4BteqrPwxzO3 mdD6G9l0YNQqAM8VSyl7SU2qLU+Pat1+6S/8Oa7JKQXzGnaXkdZB5LukzWjHAuzNHP xUvNJbNTIzxHBVvdsXtxdal+t0TSHfgchHy/ov+o= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Peilin Ye , Marcel Holtmann , syzbot+24ebd650e20bd263ca01@syzkaller.appspotmail.com Subject: [PATCH 5.4 068/453] Bluetooth: Fix slab-out-of-bounds read in hci_le_direct_adv_report_evt() Date: Mon, 28 Dec 2020 13:45:04 +0100 Message-Id: <20201228124940.518851728@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124937.240114599@linuxfoundation.org> References: <20201228124937.240114599@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: Peilin Ye commit f7e0e8b2f1b0a09b527885babda3e912ba820798 upstream. `num_reports` is not being properly checked. A malformed event packet with a large `num_reports` number makes hci_le_direct_adv_report_evt() read out of bounds. Fix it. Cc: stable@vger.kernel.org Fixes: 2f010b55884e ("Bluetooth: Add support for handling LE Direct Advertising Report events") Reported-and-tested-by: syzbot+24ebd650e20bd263ca01@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=24ebd650e20bd263ca01 Signed-off-by: Peilin Ye Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hci_event.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -5711,21 +5711,19 @@ static void hci_le_direct_adv_report_evt struct sk_buff *skb) { u8 num_reports = skb->data[0]; - void *ptr = &skb->data[1]; + struct hci_ev_le_direct_adv_info *ev = (void *)&skb->data[1]; - hci_dev_lock(hdev); + if (!num_reports || skb->len < num_reports * sizeof(*ev) + 1) + return; - while (num_reports--) { - struct hci_ev_le_direct_adv_info *ev = ptr; + hci_dev_lock(hdev); + for (; num_reports; num_reports--, ev++) process_adv_report(hdev, ev->evt_type, &ev->bdaddr, ev->bdaddr_type, &ev->direct_addr, ev->direct_addr_type, ev->rssi, NULL, 0, false); - ptr += sizeof(*ev); - } - hci_dev_unlock(hdev); }