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[v1] Bluetooth: hci_sync: Fix not checking error on hci_cmd_sync_cancel_sync

Message ID 20240326164317.1460864-1-luiz.dentz@gmail.com
State New
Headers show
Series [v1] Bluetooth: hci_sync: Fix not checking error on hci_cmd_sync_cancel_sync | expand

Commit Message

Luiz Augusto von Dentz March 26, 2024, 4:43 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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: 711c35949648 ("Bluetooth: hci_core: Cancel request on command timeout")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/hci_core.c | 6 +++---
 net/bluetooth/hci_sync.c | 5 ++++-
 2 files changed, 7 insertions(+), 4 deletions(-)

Comments

Linux regression tracking (Thorsten Leemhuis) March 26, 2024, 6:46 p.m. UTC | #1 
On 26.03.24 17:43, Luiz Augusto von Dentz wrote:
> From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> 
> 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: 711c35949648 ("Bluetooth: hci_core: Cancel request on command timeout")
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This fixed my problem:

Reported-and-tested-by: Thorsten Leemhuis <linux@leemhuis.info>
Closes:
https://lore.kernel.org/all/08275279-7462-4f4a-a0ee-8aa015f829bc@leemhuis.info/

Ciao, Thorsten
diff mbox series

Patch

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 1690ae57a09d..a7028d38c1f5 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -2874,7 +2874,7 @@  static void hci_cancel_cmd_sync(struct hci_dev *hdev, int err)
 	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 */
@@ -2894,7 +2894,7 @@  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);
@@ -4210,7 +4210,7 @@  static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb)
 
 	err = hci_send_frame(hdev, skb);
 	if (err < 0) {
-		hci_cmd_sync_cancel_sync(hdev, err);
+		hci_cmd_sync_cancel_sync(hdev, -err);
 		return;
 	}
 
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 639090b9f4b8..8fe02921adf1 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -617,7 +617,10 @@  void hci_cmd_sync_cancel_sync(struct hci_dev *hdev, int err)
 	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);