linux-kernel - Re: [PATCH] Bluetooth: Fix removing adv when processing cmd complete

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Message-ID: <CABBYNZKyJ7wJC5HcYy24LayrysywqjcRpAkMtHmm7=UrfucV4Q@mail.gmail.com>
Date:   Thu, 28 Oct 2021 15:13:36 -0700
From:   Luiz Augusto von Dentz <luiz.dentz@...il.com>
To:     Archie Pusaka <apusaka@...gle.com>
Cc:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        Sonny Sasaka <sonnysasaka@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>
Subject: Re: [PATCH] Bluetooth: Fix removing adv when processing cmd complete

Hi Archie,

On Thu, Oct 28, 2021 at 4:17 AM Archie Pusaka <apusaka@...gle.com> wrote:
>
> From: Archie Pusaka <apusaka@...omium.org>
>
> If we remove one instance of adv using Set Extended Adv Enable, there
> is a possibility of issue occurs when processing the Command Complete
> event. Especially, the adv_info might not be found since we already
> remove it in hci_req_clear_adv_instance() -> hci_remove_adv_instance().
> If that's the case, we will mistakenly proceed to remove all adv
> instances instead of just one single instance.
>
> This patch fixes the issue by checking the content of the HCI command
> instead of checking whether the adv_info is found.
>
> Signed-off-by: Archie Pusaka <apusaka@...omium.org>
> Reviewed-by: Sonny Sasaka <sonnysasaka@...omium.org>
>
> ---
>
>  net/bluetooth/hci_event.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 3cba2bbefcd6..894670419a27 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -1326,8 +1326,10 @@ static void hci_cc_le_set_ext_adv_enable(struct hci_dev *hdev,
>                                            &conn->le_conn_timeout,
>                                            conn->conn_timeout);
>         } else {
> -               if (adv) {
> -                       adv->enabled = false;
> +               if (cp->num_of_sets) {
> +                       if (adv)
> +                               adv->enabled = false;
> +
>                         /* If just one instance was disabled check if there are
>                          * any other instance enabled before clearing HCI_LE_ADV
>                          */
> --
> 2.33.0.1079.g6e70778dc9-goog

Applied, thanks.

-- 
Luiz Augusto von Dentz