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Subject: Re: [PATCH] Bluetooth: avoid hci_dev_test_and_set_flag() in
 mgmt_init_hdev()
From:   patchwork-bot+bluetooth@kernel.org
Message-Id: <166318621582.18930.5263572054834552054.git-patchwork-notify@kernel.org>
Date:   Wed, 14 Sep 2022 20:10:15 +0000
References: <f6de02d1-dcda-0383-739d-27484b4d5c63@I-love.SAKURA.ne.jp>
In-Reply-To: <f6de02d1-dcda-0383-739d-27484b4d5c63@I-love.SAKURA.ne.jp>
To:     Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc:     marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com,
        syzbot+844c7bf1b1aa4119c5de@syzkaller.appspotmail.com,
        linux-bluetooth@vger.kernel.org, syzkaller-bugs@googlegroups.com
Precedence: bulk

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <luiz.von.dentz@intel.com>:

On Mon, 12 Sep 2022 01:21:42 +0900 you wrote:
> syzbot is again reporting attempt to cancel uninitialized work
> at mgmt_index_removed() [1], for setting of HCI_MGMT flag from
> mgmt_init_hdev() from hci_mgmt_cmd() from hci_sock_sendmsg() can
> race with testing of HCI_MGMT flag from mgmt_index_removed() from
> hci_sock_bind() due to lack of serialization via hci_dev_lock().
> 
> Since mgmt_init_hdev() is called with mgmt_chan_list_lock held, we can
> safely split hci_dev_test_and_set_flag() into hci_dev_test_flag() and
> hci_dev_set_flag(). Thus, in order to close this race, set HCI_MGMT flag
> after INIT_DELAYED_WORK() completed.
> 
> [...]

Here is the summary with links:
  - Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev()
    https://git.kernel.org/bluetooth/bluetooth-next/c/f74ca25d6d66

You are awesome, thank you!
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