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Thu, 15 Oct 2026 19:10:53 -0700 (PDT) From: Artem Dinaburg To: stable@vger.kernel.org Cc: halves@igalia.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, luiz.dentz@gmail.com, luiz.von.dentz@intel.com, marcel@holtmann.org Subject: [PATCH 6.6.y 1/2] Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close Date: Thu, 15 Oct 2026 22:10:46 -0400 Message-ID: <20261016021047.16461-2-artem@trailofbits.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261016021047.16461-1-artem@trailofbits.com> References: <20261016021047.16461-1-artem@trailofbits.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Heitor Alves de Siqueira [ Upstream commit 525daaea459fc215f432de1b8debbd9144bf97b0 ] Since hci_dev_close_sync() can now be called during the reset path, we should also set HCI_CMD_DRAIN_WORKQUEUE. This avoids queuing timeouts while the hdev workqueue is being drained. Fixes: 877afadad2dc ("Bluetooth: When HCI work queue is drained, only queue chained work") Signed-off-by: Heitor Alves de Siqueira Signed-off-by: Luiz Augusto von Dentz Assisted-by: LLM Signed-off-by: Artem Dinaburg --- Hi, Please consider this backport of the fix for CVE-2026-63974 to 6.6.y. The code changes are identical to upstream. The complete fix is already present in 6.12.y, 6.18.y and 7.2.y. Build-tested only as part of a cumulative 6.6.y series on x86_64 (allmodconfig, CONFIG_WERROR=y); no runtime testing. Thanks, Artem Dinaburg net/bluetooth/hci_sync.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index 607667cc357558ffefa812e1cf001ca923fdbf78..0c96e048d8816016c44f8d1b90c99f4addda8ed8 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -5349,6 +5349,12 @@ int hci_dev_close_sync(struct hci_dev *hdev) bt_dev_dbg(hdev, ""); + /* Set HCI_DRAIN_WORKQUEUE flag to prevent queuing work during + * reset/close. See hci_cmd_work() and handle_cmd_cnt_and_timer(). + */ + hci_dev_set_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE); + synchronize_rcu(); + cancel_delayed_work(&hdev->power_off); cancel_delayed_work(&hdev->ncmd_timer); cancel_delayed_work(&hdev->le_scan_disable); @@ -5367,6 +5373,7 @@ int hci_dev_close_sync(struct hci_dev *hdev) if (!test_and_clear_bit(HCI_UP, &hdev->flags)) { cancel_delayed_work_sync(&hdev->cmd_timer); + hci_dev_clear_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE); return err; } @@ -5467,6 +5474,7 @@ int hci_dev_close_sync(struct hci_dev *hdev) /* Clear flags */ hdev->flags &= BIT(HCI_RAW); hci_dev_clear_volatile_flags(hdev); + hci_dev_clear_flag(hdev, HCI_CMD_DRAIN_WORKQUEUE); memset(hdev->eir, 0, sizeof(hdev->eir)); memset(hdev->dev_class, 0, sizeof(hdev->dev_class));