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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 143BDC2BB86 for ; Sat, 11 Apr 2020 23:14:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D19C72084D for ; Sat, 11 Apr 2020 23:14:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586646876; bh=MQrhq1PQAbbHEOt6Vnp7aTJD2bbSPul7BqLClBPI6Fs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=CYdWfC7MZxqcFf8Y7PdeHgBFCJsUE0iZIyB2N6K74phYfxpABxcV7AtWoRwgwbsSO ZbU8K8zxK7tr4NulIYsaKRfbpSGfMqF/reSb+zba8p1onca6cy6oxFAemPtlZjc9Gd 64HEsMAiMC5a2Geywzwb/A+xyBjWwdDxmcZwaVMM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730184AbgDKXOf (ORCPT ); Sat, 11 Apr 2020 19:14:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:56156 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730018AbgDKXO0 (ORCPT ); Sat, 11 Apr 2020 19:14:26 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2470F20708; Sat, 11 Apr 2020 23:14:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586646866; bh=MQrhq1PQAbbHEOt6Vnp7aTJD2bbSPul7BqLClBPI6Fs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mq5f7cX7R9V+0Rs2U4920kH386zHGiAk+K54TlRHByfm6oAVpxuxa0yreu9gQizHw 6BR2tJ82gd1zl/NIjge/cMSPSLvUXxs07b7u0iRys1+uWl2955uABk8Ubk0q6dEAjn DdkcK5EBnzbD3u7L9r4xkba9neGDuTKeOqfSZsbE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alain Michaud , Marcel Holtmann , Sasha Levin , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 11/26] Bluetooth: guard against controllers sending zero'd events Date: Sat, 11 Apr 2020 19:13:58 -0400 Message-Id: <20200411231413.26911-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200411231413.26911-1-sashal@kernel.org> References: <20200411231413.26911-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alain Michaud [ Upstream commit 08bb4da90150e2a225f35e0f642cdc463958d696 ] Some controllers have been observed to send zero'd events under some conditions. This change guards against this condition as well as adding a trace to facilitate diagnosability of this condition. Signed-off-by: Alain Michaud Signed-off-by: Marcel Holtmann Signed-off-by: Sasha Levin --- net/bluetooth/hci_event.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 6f78489fdb132..227b2e14eaeac 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -5249,6 +5249,11 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb) u8 status = 0, event = hdr->evt, req_evt = 0; u16 opcode = HCI_OP_NOP; + if (!event) { + bt_dev_warn(hdev, "Received unexpected HCI Event 00000000"); + goto done; + } + if (hdev->sent_cmd && bt_cb(hdev->sent_cmd)->hci.req_event == event) { struct hci_command_hdr *cmd_hdr = (void *) hdev->sent_cmd->data; opcode = __le16_to_cpu(cmd_hdr->opcode); @@ -5460,6 +5465,7 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb) req_complete_skb(hdev, status, opcode, orig_skb); } +done: kfree_skb(orig_skb); kfree_skb(skb); hdev->stat.evt_rx++; -- 2.20.1