[PATCH 6.6 347/396] Bluetooth: hci_sync: Fix not checking error on hci_cmd_sync_cancel_sync

Greg Kroah-Hartman
2024-04-01T16:53:37Z

From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

commit 1c3366abdbe884be62e5a7502b4db758aa3974c6 upstream.

hci_cmd_sync_cancel_sync shall check the error passed to it since it
will be propagated using req_result which is __u32 it needs to be
properly set to a positive value if it was passed as negative othertise
IS_ERR will not trigger as -(errno) would be converted to a positive
value.

Fixes: 63298d6e752f ("Bluetooth: hci_core: Cancel request on command timeout")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Reported-and-tested-by: Thorsten Leemhuis <linux@leemhuis.info>
Closes: https://lore.kernel.org/all/08275279-7462-4f4a-a0ee-8aa015f829bc@leemhuis.info/
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/bluetooth/hci_core.c | 6 +++---
net/bluetooth/hci_sync.c | 5 ++++-
2 files changed, 7 insertions(+), 4 deletions(-)

--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2842,7 +2842,7 @@ static void hci_cancel_cmd_sync(struct h
cancel_delayed_work_sync(&hdev->ncmd_timer);
atomic_set(&hdev->cmd_cnt, 1);

- hci_cmd_sync_cancel_sync(hdev, -err);
+ hci_cmd_sync_cancel_sync(hdev, err);
}

/* Suspend HCI device */
@@ -2862,7 +2862,7 @@ int hci_suspend_dev(struct hci_dev *hdev
return 0;

/* Cancel potentially blocking sync operation before suspend */
- hci_cancel_cmd_sync(hdev, -EHOSTDOWN);
+ hci_cancel_cmd_sync(hdev, EHOSTDOWN);

hci_req_sync_lock(hdev);
ret = hci_suspend_sync(hdev);
@@ -4178,7 +4178,7 @@ static void hci_send_cmd_sync(struct hci

err = hci_send_frame(hdev, skb);
if (err < 0) {
- hci_cmd_sync_cancel_sync(hdev, err);
+ hci_cmd_sync_cancel_sync(hdev, -err);
return;
}

--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -679,7 +679,10 @@ void hci_cmd_sync_cancel_sync(struct hci
bt_dev_dbg(hdev, "err 0x%2.2x", err);

if (hdev->req_status == HCI_REQ_PEND) {
- hdev->req_result = err;
+ /* req_result is __u32 so error must be positive to be properly
+ * propagated.
+ */
+ hdev->req_result = err < 0 ? -err : err;
hdev->req_status = HCI_REQ_CANCELED;

wake_up_interruptible(&hdev->req_wait_q);