6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit f53e1c9c726d83092167f2226f32bd3b73f26c21 ]
If mgmt_index_removed is called while there are commands queued on cmd_sync it could lead to crashes like the bellow trace:
0x0000053D: __list_del_entry_valid_or_report+0x98/0xdc 0x0000053D: mgmt_pending_remove+0x18/0x58 [bluetooth] 0x0000053E: mgmt_remove_adv_monitor_complete+0x80/0x108 [bluetooth] 0x0000053E: hci_cmd_sync_work+0xbc/0x164 [bluetooth]
So while handling mgmt_index_removed this attempts to dequeue commands passed as user_data to cmd_sync.
Fixes: 7cf5c2978f23 ("Bluetooth: hci_sync: Refactor remove Adv Monitor") Reported-by: jiaymao quic_jiaymao@quicinc.com Signed-off-by: Luiz Augusto von Dentz luiz.von.dentz@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/bluetooth/mgmt.c | 23 ++++++++++++++--------- 1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 149aff29e5646..1f3a39c20a911 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -1446,10 +1446,15 @@ static void cmd_status_rsp(struct mgmt_pending_cmd *cmd, void *data)
static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data) { - if (cmd->cmd_complete) { - u8 *status = data; + struct cmd_lookup *match = data; + + /* dequeue cmd_sync entries using cmd as data as that is about to be + * removed/freed. + */ + hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL);
- cmd->cmd_complete(cmd, *status); + if (cmd->cmd_complete) { + cmd->cmd_complete(cmd, match->mgmt_status); mgmt_pending_remove(cmd);
return; @@ -9342,12 +9347,12 @@ void mgmt_index_added(struct hci_dev *hdev) void mgmt_index_removed(struct hci_dev *hdev) { struct mgmt_ev_ext_index ev; - u8 status = MGMT_STATUS_INVALID_INDEX; + struct cmd_lookup match = { NULL, hdev, MGMT_STATUS_INVALID_INDEX };
if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks)) return;
- mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &status); + mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) { mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0, @@ -9398,7 +9403,7 @@ void mgmt_power_on(struct hci_dev *hdev, int err) void __mgmt_power_off(struct hci_dev *hdev) { struct cmd_lookup match = { NULL, hdev }; - u8 status, zero_cod[] = { 0, 0, 0 }; + u8 zero_cod[] = { 0, 0, 0 };
mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
@@ -9410,11 +9415,11 @@ void __mgmt_power_off(struct hci_dev *hdev) * status responses. */ if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) - status = MGMT_STATUS_INVALID_INDEX; + match.mgmt_status = MGMT_STATUS_INVALID_INDEX; else - status = MGMT_STATUS_NOT_POWERED; + match.mgmt_status = MGMT_STATUS_NOT_POWERED;
- mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &status); + mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
if (memcmp(hdev->dev_class, zero_cod, sizeof(zero_cod)) != 0) { mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev,