Bluetooth: MGMT: Fix possible deadlocks

[ Upstream commit a66dfaf ]

This fixes possible deadlocks like the following caused by
hci_cmd_sync_dequeue causing the destroy function to run:

 INFO: task kworker/u19:0:143 blocked for more than 120 seconds.
       Tainted: G        W  O        6.8.0-2024-03-19-intel-next-iLS-24ww14 #1
 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
 task:kworker/u19:0   state:D stack:0     pid:143   tgid:143   ppid:2      flags:0x00004000
 Workqueue: hci0 hci_cmd_sync_work [bluetooth]
 Call Trace:
  <TASK>
  __schedule+0x374/0xaf0
  schedule+0x3c/0xf0
  schedule_preempt_disabled+0x1c/0x30
  __mutex_lock.constprop.0+0x3ef/0x7a0
  __mutex_lock_slowpath+0x13/0x20
  mutex_lock+0x3c/0x50
  mgmt_set_connectable_complete+0xa4/0x150 [bluetooth]
  ? kfree+0x211/0x2a0
  hci_cmd_sync_dequeue+0xae/0x130 [bluetooth]
  ? __pfx_cmd_complete_rsp+0x10/0x10 [bluetooth]
  cmd_complete_rsp+0x26/0x80 [bluetooth]
  mgmt_pending_foreach+0x4d/0x70 [bluetooth]
  __mgmt_power_off+0x8d/0x180 [bluetooth]
  ? _raw_spin_unlock_irq+0x23/0x40
  hci_dev_close_sync+0x445/0x5b0 [bluetooth]
  hci_set_powered_sync+0x149/0x250 [bluetooth]
  set_powered_sync+0x24/0x60 [bluetooth]
  hci_cmd_sync_work+0x90/0x150 [bluetooth]
  process_one_work+0x13e/0x300
  worker_thread+0x2f7/0x420
  ? __pfx_worker_thread+0x10/0x10
  kthread+0x107/0x140
  ? __pfx_kthread+0x10/0x10
  ret_from_fork+0x3d/0x60
  ? __pfx_kthread+0x10/0x10
  ret_from_fork_asm+0x1b/0x30
  </TASK>

Tested-by: Kiran K <[email protected]>
Fixes: f53e1c9 ("Bluetooth: MGMT: Fix possible crash on mgmt_index_removed")
Signed-off-by: Luiz Augusto von Dentz <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>

net/bluetooth/mgmt.c

@@ -1510,7 +1510,8 @@ static void mgmt_set_discoverable_complete(struct hci_dev *hdev, void *data,
 	bt_dev_dbg(hdev, "err %d", err);
 
 	/* Make sure cmd still outstanding. */
-	if (cmd != pending_find(MGMT_OP_SET_DISCOVERABLE, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_SET_DISCOVERABLE, hdev))
 		return;
 
 	hci_dev_lock(hdev);
@@ -1684,7 +1685,8 @@ static void mgmt_set_connectable_complete(struct hci_dev *hdev, void *data,
 	bt_dev_dbg(hdev, "err %d", err);
 
 	/* Make sure cmd still outstanding. */
-	if (cmd != pending_find(MGMT_OP_SET_CONNECTABLE, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_SET_CONNECTABLE, hdev))
 		return;
 
 	hci_dev_lock(hdev);
@@ -1917,7 +1919,7 @@ static void set_ssp_complete(struct hci_dev *hdev, void *data, int err)
 	bool changed;
 
 	/* Make sure cmd still outstanding. */
-	if (cmd != pending_find(MGMT_OP_SET_SSP, hdev))
+	if (err == -ECANCELED || cmd != pending_find(MGMT_OP_SET_SSP, hdev))
 		return;
 
 	if (err) {
@@ -3782,7 +3784,8 @@ static void set_name_complete(struct hci_dev *hdev, void *data, int err)
 
 	bt_dev_dbg(hdev, "err %d", err);
 
-	if (cmd != pending_find(MGMT_OP_SET_LOCAL_NAME, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_SET_LOCAL_NAME, hdev))
 		return;
 
 	if (status) {
@@ -3957,7 +3960,8 @@ static void set_default_phy_complete(struct hci_dev *hdev, void *data, int err)
 	struct sk_buff *skb = cmd->skb;
 	u8 status = mgmt_status(err);
 
-	if (cmd != pending_find(MGMT_OP_SET_PHY_CONFIGURATION, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_SET_PHY_CONFIGURATION, hdev))
 		return;
 
 	if (!status) {
@@ -5848,13 +5852,16 @@ static void start_discovery_complete(struct hci_dev *hdev, void *data, int err)
 {
 	struct mgmt_pending_cmd *cmd = data;
 
+	bt_dev_dbg(hdev, "err %d", err);
+
+	if (err == -ECANCELED)
+		return;
+
 	if (cmd != pending_find(MGMT_OP_START_DISCOVERY, hdev) &&
 	    cmd != pending_find(MGMT_OP_START_LIMITED_DISCOVERY, hdev) &&
 	    cmd != pending_find(MGMT_OP_START_SERVICE_DISCOVERY, hdev))
 		return;
 
-	bt_dev_dbg(hdev, "err %d", err);
-
 	mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
 			  cmd->param, 1);
 	mgmt_pending_remove(cmd);
@@ -6087,7 +6094,8 @@ static void stop_discovery_complete(struct hci_dev *hdev, void *data, int err)
 {
 	struct mgmt_pending_cmd *cmd = data;
 
-	if (cmd != pending_find(MGMT_OP_STOP_DISCOVERY, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_STOP_DISCOVERY, hdev))
 		return;
 
 	bt_dev_dbg(hdev, "err %d", err);
@@ -8032,7 +8040,8 @@ static void read_local_oob_ext_data_complete(struct hci_dev *hdev, void *data,
 	u8 status = mgmt_status(err);
 	u16 eir_len;
 
-	if (cmd != pending_find(MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev))
+	if (err == -ECANCELED ||
+	    cmd != pending_find(MGMT_OP_READ_LOCAL_OOB_EXT_DATA, hdev))
 		return;
 
 	if (!status) {