From patchwork Wed Nov 10 12:09:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zijun Hu X-Patchwork-Id: 518267 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 41B76C433EF for ; Wed, 10 Nov 2021 12:09:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 31CAE61247 for ; Wed, 10 Nov 2021 12:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231817AbhKJMMo (ORCPT ); Wed, 10 Nov 2021 07:12:44 -0500 Received: from so254-9.mailgun.net ([198.61.254.9]:52367 "EHLO so254-9.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231775AbhKJMMa (ORCPT ); Wed, 10 Nov 2021 07:12:30 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1636546183; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=xI64hCz1HNiVpcCIETPeu0F3pBC1lsCOTonaWoQ+rrQ=; b=cpwRxkea+bdvXtfjKuQn9tK5o1Vd82hc3uh3wOUx6Dj3fV9E9qk0uUbAsIfTwMAX+tNiDeeH M9T8ZAn6UDvZb/KuGRdfW+h5AKpxmbUUBU3/dQxsthg8MjAZOuPX/010fDuCaGZDQxQNYpbE jAaDw9iw30Ox3bslUi+FWZvpK6E= X-Mailgun-Sending-Ip: 198.61.254.9 X-Mailgun-Sid: WyI2MTA3ZSIsICJsaW51eC1ibHVldG9vdGhAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-east-1.postgun.com with SMTP id 618bb6850f34c3436aca1692 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 10 Nov 2021 12:09:41 GMT Sender: zijuhu=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id DB611C43635; Wed, 10 Nov 2021 12:09:40 +0000 (UTC) Received: from zijuhu-gv.qualcomm.com (unknown [180.166.53.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: zijuhu) by smtp.codeaurora.org (Postfix) with ESMTPSA id A83B3C43618; Wed, 10 Nov 2021 12:09:27 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org A83B3C43618 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=codeaurora.org From: Zijun Hu To: marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com Cc: linux-kernel@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-arm-msm@vger.kernel.org, c-hbandi@codeaurora.org, hemantg@codeaurora.org, rjliao@codeaurora.org, zijuhu@codeaurora.org, Zijun Hu Subject: [PATCH v1] Bluetooth: hci_h4: Fix padding calculation error within h4_recv_buf() Date: Wed, 10 Nov 2021 20:09:19 +0800 Message-Id: <1636546159-8339-1-git-send-email-zijuhu@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Zijun Hu it is erroneous to calculate padding by subtracting length of type indication from skb->len, it will cause data analysis error for alignment which is greater than 1, so fixed by adding length of type indication with skb->len. Signed-off-by: Zijun Hu --- drivers/bluetooth/hci_h4.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/bluetooth/hci_h4.c b/drivers/bluetooth/hci_h4.c index 4b3b14a34794..1d0cdf023243 100644 --- a/drivers/bluetooth/hci_h4.c +++ b/drivers/bluetooth/hci_h4.c @@ -252,7 +252,7 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb, } if (!dlen) { - hu->padding = (skb->len - 1) % alignment; + hu->padding = (skb->len + 1) % alignment; hu->padding = (alignment - hu->padding) % alignment; /* No more data, complete frame */ @@ -260,7 +260,7 @@ struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb, skb = NULL; } } else { - hu->padding = (skb->len - 1) % alignment; + hu->padding = (skb->len + 1) % alignment; hu->padding = (alignment - hu->padding) % alignment; /* Complete frame */