Bluetooth: Fix missing hci_dev_lock/unlock in mgmt req_complete()

mgmt_pending_remove() should be called with hci_dev_lock protection
and currently the rule to take dev lock is that all mgmt req_complete
functions should take dev lock. So this patch fixes the same in the
missing functions

Without this patch there is a chance of invalid memory access while
accessing the mgmt_pending list like below

bluetoothd:  392] [0] Backtrace:
bluetoothd:  392] [0] [<c04ec770>] (pending_eir_or_class+0x0/0x68) from [<c04f1830>] (add_uuid+0x34/0x1c4)
bluetoothd:  392] [0] [<c04f17fc>] (add_uuid+0x0/0x1c4) from [<c04f3cc4>] (mgmt_control+0x204/0x274)
bluetoothd:  392] [0] [<c04f3ac0>] (mgmt_control+0x0/0x274) from [<c04f609c>] (hci_sock_sendmsg+0x80/0x308)
bluetoothd:  392] [0] [<c04f601c>] (hci_sock_sendmsg+0x0/0x308) from [<c03d4d68>] (sock_aio_write+0x144/0x174)
bluetoothd:  392] [0]  r8:00000000 r7 7c1be90 r6 7c1be18 r5:00000017 r4 a90ea80
bluetoothd:  392] [0] [<c03d4c24>] (sock_aio_write+0x0/0x174) from [<c00e2d4c>] (do_sync_write+0xb0/0xe0)
bluetoothd:  392] [0] [<c00e2c9c>] (do_sync_write+0x0/0xe0) from [<c00e371c>] (vfs_write+0x134/0x13c)
bluetoothd:  392] [0]  r8:00000000 r7 7c1bf70 r6:beeca5c8 r5:00000017 r4 7c05900
bluetoothd:  392] [0] [<c00e35e8>] (vfs_write+0x0/0x13c) from [<c00e3910>] (sys_write+0x44/0x70)
bluetoothd:  392] [0]  r8:00000000 r7:00000004 r6:00000017 r5:beeca5c8 r4 7c05900
bluetoothd:  392] [0] [<c00e38cc>] (sys_write+0x0/0x70) from [<c000e3c0>] (ret_fast_syscall+0x0/0x30)
bluetoothd:  392] [0]  r9 7c1a000 r8:c000e568 r6:400b5f10 r5:403896d8 r4:beeca604
bluetoothd:  392] [0] Code: e28cc00c e152000c 0a00000f e3a00001 (e1d210b8)
bluetoothd:  392] [0] ---[ end trace 67b6ac67435864c4 ]---
bluetoothd:  392] [0] Kernel panic - not syncing: Fatal exception

Signed-off-by: Jaganath Kanakkassery <jaganath.k@samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

2 files changed, 14 insertions, 6 deletions

diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 96e7321c57a4..ecd7c01317bc 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3083,7 +3083,9 @@ static void hci_power_on(struct work_struct *work)
 
         err = hci_dev_do_open(hdev);
         if (err < 0) {
+                hci_dev_lock(hdev);
                 mgmt_set_powered_failed(hdev, err);
+                hci_dev_unlock(hdev);
                 return;
         }
 
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 44b20deb6038..16ac03730f4d 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -2199,12 +2199,14 @@ static void le_enable_complete(struct hci_dev *hdev, u8 status)
 {
         struct cmd_lookup match = { NULL, hdev };
 
+        hci_dev_lock(hdev);
+
         if (status) {
                 u8 mgmt_err = mgmt_status(status);
 
                 mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, cmd_status_rsp,
                                      &mgmt_err);
-                return;
+                goto unlock;
         }
 
         mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, settings_rsp, &match);
@@ -2222,17 +2224,16 @@ static void le_enable_complete(struct hci_dev *hdev, u8 status)
         if (test_bit(HCI_LE_ENABLED, &hdev->dev_flags)) {
                 struct hci_request req;
 
-                hci_dev_lock(hdev);
-
                 hci_req_init(&req, hdev);
                 update_adv_data(&req);
                 update_scan_rsp_data(&req);
                 hci_req_run(&req, NULL);
 
                 hci_update_background_scan(hdev);
-
-                hci_dev_unlock(hdev);
         }
+
+unlock:
+        hci_dev_unlock(hdev);
 }
 
 static int set_le(struct sock *sk, struct hci_dev *hdev, void *data, u16 len)
@@ -4279,12 +4280,14 @@ static void set_advertising_complete(struct hci_dev *hdev, u8 status)
 {
         struct cmd_lookup match = { NULL, hdev };
 
+        hci_dev_lock(hdev);
+
         if (status) {
                 u8 mgmt_err = mgmt_status(status);
 
                 mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev,
                                      cmd_status_rsp, &mgmt_err);
-                return;
+                goto unlock;
         }
 
         if (test_bit(HCI_LE_ADV, &hdev->dev_flags))
@@ -4299,6 +4302,9 @@ static void set_advertising_complete(struct hci_dev *hdev, u8 status)
 
         if (match.sk)
                 sock_put(match.sk);
+
+unlock:
+        hci_dev_unlock(hdev);
 }
 
 static int set_advertising(struct sock *sk, struct hci_dev *hdev, void *data,