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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,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 2005FC43465 for ; Fri, 18 Sep 2020 03:05:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D1D00206B7 for ; Fri, 18 Sep 2020 03:05:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600398337; bh=4Q7mw5KAqcmnZ9t/lXxKuMpRFZq7oX7lNAzl9x/GlCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=UQuN/9wsO0QtSEdfLqD24UFj3dXu29l/CydVxp82yRgU2CsDUKe59kPpLXj0XfZVO QAHmxBpJpyam5ew0k/P3ekta3TlV50XCzIz4ZXyRmcPRQ93NMdXicvX0V2Wh2s1osU nJGw8FIFSMs2foSJUaP8wQ9z8Kg5N413ApYr7f7Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727279AbgIRCET (ORCPT ); Thu, 17 Sep 2020 22:04:19 -0400 Received: from mail.kernel.org ([198.145.29.99]:51528 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727265AbgIRCET (ORCPT ); Thu, 17 Sep 2020 22:04:19 -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 45D3223772; Fri, 18 Sep 2020 02:04:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600394655; bh=4Q7mw5KAqcmnZ9t/lXxKuMpRFZq7oX7lNAzl9x/GlCo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BqVrmF9fPi1iYlGFY9omnu4mvC9FGE3KgAuA8Uz2MZROfMIoQy3O0q+NxHkuMY1no wTjOsbmvhqZqt+7QEp29RsE4AlZQAKbP7TD9WkC+iWPRu+rTHC8SPBEpqdLPL0S5o6 ZrT3s9HNus7RwWE3pVdpfm6PR0t0xHP5hubjkdZo= 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 5.4 151/330] Bluetooth: guard against controllers sending zero'd events Date: Thu, 17 Sep 2020 21:58:11 -0400 Message-Id: <20200918020110.2063155-151-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918020110.2063155-1-sashal@kernel.org> References: <20200918020110.2063155-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@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 7bf6860fed783..1bbeb14b8b64e 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -5853,6 +5853,11 @@ 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); @@ -6064,6 +6069,7 @@ 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++; -- 2.25.1