From: Marcel Holtmann <marcel@holtmann.org>
To: Zumeng Chen <zumeng.chen@gmail.com>
Cc: linux-bluetooth@vger.kernel.org,
Johan Hedberg <johan.hedberg@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] Bluetooth: make the balance of judgement condition to fix a false report
Date: Wed, 14 Nov 2018 08:54:35 +0100 [thread overview]
Message-ID: <5A23C871-B30F-44C4-898B-C138EFDB4893@holtmann.org> (raw)
In-Reply-To: <1541656065-111693-1-git-send-email-zumeng.chen@gmail.com>
Hi Zumeng,
> This patch is to balance the condition scope between hci_get_cmd_complete and
> hci_event_packet about orig_skb as follows:
>
> if (req_complete_skb || event == HCI_EV_CMD_STATUS ||
> event == HCI_EV_CMD_COMPLETE)
> orig_skb = skb_clone(skb, GFP_KERNEL);
>
> And hci_get_cmd_complete will bt_dev_err out when HCI_EV_CMD_STATUS, so a lot
> of asymmetric conditions are triggered. Since both of them are the entry into
> hci_get_cmd_complete, we'd better get STATUS into judge the false out there.
>
> Signed-off-by: Zumeng Chen <zumeng.chen@gmail.com>
> ---
>
> Hi expert,
>
> This issue existed whether or not T_DBG had been changed into bt_dev_err, which
> just shows the issue explicitly. I noticed actually that opcode doesn't match
> ev->opcode either at the same time. And there might be some logic issue about
> HCI_EV_CMD_COMPLETE between protocol and drivers. I'm not familar with the whole
> bluetooth protocol, and not gonna to dig more, so all yours guys~
>
> Cheers,
> Zumeng
>
> net/bluetooth/hci_event.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 235b5aa..d848663 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -5217,7 +5217,8 @@ static bool hci_get_cmd_complete(struct hci_dev *hdev, u16 opcode,
> return true;
> }
>
> - if (hdr->evt != HCI_EV_CMD_COMPLETE) {
> + if (!((hdr->evt == HCI_EV_CMD_COMPLETE) ||
> + (hdr->evt == HCI_EV_CMD_STATUS))) {
this indentation is messed up. Also some braces are not needed.
if (!(hdr->evt == HCI_EV_CMD_COMPLETE ||
hdr->evt == HCI_EV_CMD_STATUS)) {
> bt_dev_err(hdev, "last event is not cmd complete (0x%2.2x)",
> hdr->evt);
> return false;
Regards
Marcel
next prev parent reply other threads:[~2018-11-14 7:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-08 5:47 [PATCH 1/1] Bluetooth: make the balance of judgement condition to fix a false report Zumeng Chen
2018-11-14 7:54 ` Marcel Holtmann [this message]
2018-11-15 1:31 ` [PATCH 1/1 v2] " Zumeng Chen
2018-11-26 11:23 ` Luiz Augusto von Dentz
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