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=-18.8 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,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 A145BC43381 for ; Mon, 28 Dec 2020 13:03:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 616DE208BA for ; Mon, 28 Dec 2020 13:03:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730192AbgL1NDN (ORCPT ); Mon, 28 Dec 2020 08:03:13 -0500 Received: from mail.kernel.org ([198.145.29.99]:59232 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730166AbgL1NDE (ORCPT ); Mon, 28 Dec 2020 08:03:04 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 497D822BEA; Mon, 28 Dec 2020 13:02:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609160543; bh=WEUAieE3Ak362iDkgtVFkxR33MpKfrCs5zA1z0i8KTc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lP1s4o61JMVpI1u70CxxZ2KMP0qBofcL8gSc8SMmBlLOmSRU/z0gDE9o/XrwOz38B gz8jMaXMCdbZCoKS4aafDKPV+aZVjdLsEaSObYaoESrHdf/ziYyYQsG2ovmE5DssT1 vEOCUkK+aBfmV3IZbXOyfYo2otsg5mjj8KZaDLV0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anmol Karn , Marcel Holtmann , Sasha Levin , syzbot+0bef568258653cff272f@syzkaller.appspotmail.com Subject: [PATCH 4.9 057/175] Bluetooth: Fix null pointer dereference in hci_event_packet() Date: Mon, 28 Dec 2020 13:48:30 +0100 Message-Id: <20201228124856.025318580@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228124853.216621466@linuxfoundation.org> References: <20201228124853.216621466@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: Anmol Karn [ Upstream commit 6dfccd13db2ff2b709ef60a50163925d477549aa ] AMP_MGR is getting derefernced in hci_phy_link_complete_evt(), when called from hci_event_packet() and there is a possibility, that hcon->amp_mgr may not be found when accessing after initialization of hcon. - net/bluetooth/hci_event.c:4945 The bug seems to get triggered in this line: bredr_hcon = hcon->amp_mgr->l2cap_conn->hcon; Fix it by adding a NULL check for the hcon->amp_mgr before checking the ev-status. Fixes: d5e911928bd8 ("Bluetooth: AMP: Process Physical Link Complete evt") Reported-and-tested-by: syzbot+0bef568258653cff272f@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=0bef568258653cff272f Signed-off-by: Anmol Karn Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin --- net/bluetooth/hci_event.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index d4c1c34cfa945..d01bf6a111cee 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -4350,6 +4350,11 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev, return; } + if (!hcon->amp_mgr) { + hci_dev_unlock(hdev); + return; + } + if (ev->status) { hci_conn_del(hcon); hci_dev_unlock(hdev); -- 2.27.0