From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit 2615fd9a7c2507eb3be3fbe49dcec88a2f56454a ]
In a few cases the stack may generate commands as responses to events which would happen to overwrite the sent_cmd, so this attempts to store the request in req_skb so even if sent_cmd is replaced with a new command the pending request will remain in stored in req_skb.
Fixes: 6a98e3836fa2 ("Bluetooth: Add helper for serialized HCI command execution") Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- include/net/bluetooth/hci_core.h | 1 + net/bluetooth/hci_conn.c | 2 +- net/bluetooth/hci_core.c | 46 ++++++++++++++++++++++---------- net/bluetooth/hci_event.c | 18 ++++++------- net/bluetooth/hci_sync.c | 21 ++++++++++++--- 5 files changed, 61 insertions(+), 27 deletions(-)
diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 65dd286693527..24446038d8a6d 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -553,6 +553,7 @@ struct hci_dev { __u32 req_status; __u32 req_result; struct sk_buff *req_skb; + struct sk_buff *req_rsp;
void *smp_data; void *smp_bredr_data; diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 029bf74ec5e78..50c55d7335692 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -2977,7 +2977,7 @@ int hci_abort_conn(struct hci_conn *conn, u8 reason) case HCI_EV_LE_CONN_COMPLETE: case HCI_EV_LE_ENHANCED_CONN_COMPLETE: case HCI_EVT_LE_CIS_ESTABLISHED: - hci_cmd_sync_cancel(hdev, -ECANCELED); + hci_cmd_sync_cancel(hdev, ECANCELED); break; } } diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 539305b9a0e27..96707deef296b 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1491,8 +1491,8 @@ static void hci_cmd_timeout(struct work_struct *work) struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_timer.work);
- if (hdev->sent_cmd) { - u16 opcode = hci_skb_opcode(hdev->sent_cmd); + if (hdev->req_skb) { + u16 opcode = hci_skb_opcode(hdev->req_skb);
bt_dev_err(hdev, "command 0x%4.4x tx timeout", opcode);
@@ -2796,6 +2796,7 @@ void hci_release_dev(struct hci_dev *hdev) ida_destroy(&hdev->unset_handle_ida); ida_simple_remove(&hci_index_ida, hdev->id); kfree_skb(hdev->sent_cmd); + kfree_skb(hdev->req_skb); kfree_skb(hdev->recv_event); kfree(hdev); } @@ -3125,21 +3126,33 @@ int __hci_cmd_send(struct hci_dev *hdev, u16 opcode, u32 plen, EXPORT_SYMBOL(__hci_cmd_send);
/* Get data from the previously sent command */ -void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode) +static void *hci_cmd_data(struct sk_buff *skb, __u16 opcode) { struct hci_command_hdr *hdr;
- if (!hdev->sent_cmd) + if (!skb || skb->len < HCI_COMMAND_HDR_SIZE) return NULL;
- hdr = (void *) hdev->sent_cmd->data; + hdr = (void *)skb->data;
if (hdr->opcode != cpu_to_le16(opcode)) return NULL;
- BT_DBG("%s opcode 0x%4.4x", hdev->name, opcode); + return skb->data + HCI_COMMAND_HDR_SIZE; +}
- return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE; +/* Get data from the previously sent command */ +void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode) +{ + void *data; + + /* Check if opcode matches last sent command */ + data = hci_cmd_data(hdev->sent_cmd, opcode); + if (!data) + /* Check if opcode matches last request */ + data = hci_cmd_data(hdev->req_skb, opcode); + + return data; }
/* Get data from last received event */ @@ -4040,17 +4053,19 @@ void hci_req_cmd_complete(struct hci_dev *hdev, u16 opcode, u8 status, if (!status && !hci_req_is_complete(hdev)) return;
+ skb = hdev->req_skb; + /* If this was the last command in a request the complete - * callback would be found in hdev->sent_cmd instead of the + * callback would be found in hdev->req_skb instead of the * command queue (hdev->cmd_q). */ - if (bt_cb(hdev->sent_cmd)->hci.req_flags & HCI_REQ_SKB) { - *req_complete_skb = bt_cb(hdev->sent_cmd)->hci.req_complete_skb; + if (skb && bt_cb(skb)->hci.req_flags & HCI_REQ_SKB) { + *req_complete_skb = bt_cb(skb)->hci.req_complete_skb; return; }
- if (bt_cb(hdev->sent_cmd)->hci.req_complete) { - *req_complete = bt_cb(hdev->sent_cmd)->hci.req_complete; + if (skb && bt_cb(skb)->hci.req_complete) { + *req_complete = bt_cb(skb)->hci.req_complete; return; }
@@ -4167,8 +4182,11 @@ static void hci_send_cmd_sync(struct hci_dev *hdev, struct sk_buff *skb) return; }
- if (hci_req_status_pend(hdev)) - hci_dev_set_flag(hdev, HCI_CMD_PENDING); + if (hci_req_status_pend(hdev) && + !hci_dev_test_and_set_flag(hdev, HCI_CMD_PENDING)) { + kfree_skb(hdev->req_skb); + hdev->req_skb = skb_clone(skb, GFP_KERNEL); + }
atomic_dec(&hdev->cmd_cnt); } diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 9ee66b393981b..6275b14b56927 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -4381,7 +4381,7 @@ static void hci_cmd_status_evt(struct hci_dev *hdev, void *data, * (since for this kind of commands there will not be a command * complete event). */ - if (ev->status || (hdev->sent_cmd && !hci_skb_event(hdev->sent_cmd))) { + if (ev->status || (hdev->req_skb && !hci_skb_event(hdev->req_skb))) { hci_req_cmd_complete(hdev, *opcode, ev->status, req_complete, req_complete_skb); if (hci_dev_test_flag(hdev, HCI_CMD_PENDING)) { @@ -7327,10 +7327,10 @@ static void hci_le_meta_evt(struct hci_dev *hdev, void *data, bt_dev_dbg(hdev, "subevent 0x%2.2x", ev->subevent);
/* Only match event if command OGF is for LE */ - if (hdev->sent_cmd && - hci_opcode_ogf(hci_skb_opcode(hdev->sent_cmd)) == 0x08 && - hci_skb_event(hdev->sent_cmd) == ev->subevent) { - *opcode = hci_skb_opcode(hdev->sent_cmd); + if (hdev->req_skb && + hci_opcode_ogf(hci_skb_opcode(hdev->req_skb)) == 0x08 && + hci_skb_event(hdev->req_skb) == ev->subevent) { + *opcode = hci_skb_opcode(hdev->req_skb); hci_req_cmd_complete(hdev, *opcode, 0x00, req_complete, req_complete_skb); } @@ -7717,10 +7717,10 @@ void hci_event_packet(struct hci_dev *hdev, struct sk_buff *skb) }
/* Only match event if command OGF is not for LE */ - if (hdev->sent_cmd && - hci_opcode_ogf(hci_skb_opcode(hdev->sent_cmd)) != 0x08 && - hci_skb_event(hdev->sent_cmd) == event) { - hci_req_cmd_complete(hdev, hci_skb_opcode(hdev->sent_cmd), + if (hdev->req_skb && + hci_opcode_ogf(hci_skb_opcode(hdev->req_skb)) != 0x08 && + hci_skb_event(hdev->req_skb) == event) { + hci_req_cmd_complete(hdev, hci_skb_opcode(hdev->req_skb), status, &req_complete, &req_complete_skb); req_evt = event; } diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index f4c53c428305b..183501f921814 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -32,6 +32,10 @@ static void hci_cmd_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode, hdev->req_result = result; hdev->req_status = HCI_REQ_DONE;
+ /* Free the request command so it is not used as response */ + kfree_skb(hdev->req_skb); + hdev->req_skb = NULL; + if (skb) { struct sock *sk = hci_skb_sk(skb);
@@ -39,7 +43,7 @@ static void hci_cmd_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode, if (sk) sock_put(sk);
- hdev->req_skb = skb_get(skb); + hdev->req_rsp = skb_get(skb); }
wake_up_interruptible(&hdev->req_wait_q); @@ -187,8 +191,8 @@ struct sk_buff *__hci_cmd_sync_sk(struct hci_dev *hdev, u16 opcode, u32 plen,
hdev->req_status = 0; hdev->req_result = 0; - skb = hdev->req_skb; - hdev->req_skb = NULL; + skb = hdev->req_rsp; + hdev->req_rsp = NULL;
bt_dev_dbg(hdev, "end: err %d", err);
@@ -4904,6 +4908,11 @@ int hci_dev_open_sync(struct hci_dev *hdev) hdev->sent_cmd = NULL; }
+ if (hdev->req_skb) { + kfree_skb(hdev->req_skb); + hdev->req_skb = NULL; + } + clear_bit(HCI_RUNNING, &hdev->flags); hci_sock_dev_event(hdev, HCI_DEV_CLOSE);
@@ -5065,6 +5074,12 @@ int hci_dev_close_sync(struct hci_dev *hdev) hdev->sent_cmd = NULL; }
+ /* Drop last request */ + if (hdev->req_skb) { + kfree_skb(hdev->req_skb); + hdev->req_skb = NULL; + } + clear_bit(HCI_RUNNING, &hdev->flags); hci_sock_dev_event(hdev, HCI_DEV_CLOSE);