Hi Jaganath,
> mgmt_pending_remove() should be called with hci_dev_lock protection
> and this patch fixes the same in the missing places.
>
> 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@xxxxxxxxxxx>
> ---
> net/bluetooth/hci_core.c | 2 ++
> net/bluetooth/hci_event.c | 22 ++++++++++++++++++++--
> net/bluetooth/mgmt.c | 18 ++++++++++++------
> 3 files changed, 34 insertions(+), 8 deletions(-)
I would split this into two patches. One for the mgmt.c and hci_core.c changes and one for hci_event.c changes.
>
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index 96e7321..ecd7c01 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;
> }
I wonder is some of the mgmt_ function should just take the hci_dev lock. Are there cases where we don't want them to take the look?
>
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 322abbb..baa6c96 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -257,6 +257,8 @@ static void hci_cc_write_auth_enable(struct hci_dev *hdev, struct sk_buff *skb)
> if (!sent)
> return;
>
> + hci_dev_lock(hdev);
> +
> if (!status) {
> __u8 param = *((__u8 *) sent);
>
> @@ -268,6 +270,8 @@ static void hci_cc_write_auth_enable(struct hci_dev *hdev, struct sk_buff *skb)
>
> if (test_bit(HCI_MGMT, &hdev->dev_flags))
> mgmt_auth_enable_complete(hdev, status);
> +
> + hci_dev_unlock(hdev);
> }
>
> static void hci_cc_write_encrypt_mode(struct hci_dev *hdev, struct sk_buff *skb)
> @@ -443,6 +447,8 @@ static void hci_cc_write_ssp_mode(struct hci_dev *hdev, struct sk_buff *skb)
> if (!sent)
> return;
>
> + hci_dev_lock(hdev);
> +
> if (!status) {
> if (sent->mode)
> hdev->features[1][0] |= LMP_HOST_SSP;
> @@ -458,6 +464,8 @@ static void hci_cc_write_ssp_mode(struct hci_dev *hdev, struct sk_buff *skb)
> else
> clear_bit(HCI_SSP_ENABLED, &hdev->dev_flags);
> }
> +
> + hci_dev_unlock(hdev);
> }
>
> static void hci_cc_write_sc_support(struct hci_dev *hdev, struct sk_buff *skb)
> @@ -471,6 +479,8 @@ static void hci_cc_write_sc_support(struct hci_dev *hdev, struct sk_buff *skb)
> if (!sent)
> return;
>
> + hci_dev_lock(hdev);
> +
> if (!status) {
> if (sent->support)
> hdev->features[1][0] |= LMP_HOST_SC;
> @@ -486,6 +496,8 @@ static void hci_cc_write_sc_support(struct hci_dev *hdev, struct sk_buff *skb)
> else
> clear_bit(HCI_SC_ENABLED, &hdev->dev_flags);
> }
> +
> + hci_dev_unlock(hdev);
> }
>
> static void hci_cc_read_local_version(struct hci_dev *hdev, struct sk_buff *skb)
> @@ -1172,9 +1184,11 @@ static void hci_cc_le_set_scan_enable(struct hci_dev *hdev,
> * re-enable it again if necessary.
> */
> if (test_and_clear_bit(HCI_LE_SCAN_INTERRUPTED,
> - &hdev->dev_flags))
> + &hdev->dev_flags)) {
> + hci_dev_lock(hdev);
> hci_discovery_set_state(hdev, DISCOVERY_STOPPED);
> - else if (!test_bit(HCI_LE_ADV, &hdev->dev_flags) &&
> + hci_dev_unlock(hdev);
> + } else if (!test_bit(HCI_LE_ADV, &hdev->dev_flags) &&
> hdev->discovery.state == DISCOVERY_FINDING)
This is now a coding style violation. You need to move this line as well.
> mgmt_reenable_advertising(hdev);
>
> @@ -1278,6 +1292,8 @@ static void hci_cc_write_le_host_supported(struct hci_dev *hdev,
> if (!sent)
> return;
>
> + hci_dev_lock(hdev);
> +
> if (sent->le) {
> hdev->features[1][0] |= LMP_HOST_LE;
> set_bit(HCI_LE_ENABLED, &hdev->dev_flags);
> @@ -1291,6 +1307,8 @@ static void hci_cc_write_le_host_supported(struct hci_dev *hdev,
> hdev->features[1][0] |= LMP_HOST_LE_BREDR;
> else
> hdev->features[1][0] &= ~LMP_HOST_LE_BREDR;
> +
> + hci_dev_unlock(hdev);
> }
>
> static void hci_cc_set_adv_param(struct hci_dev *hdev, struct sk_buff *skb)
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 44b20de..16ac037 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);
> }
>
Regards
Marcel
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