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Bluetooth: MGMT: Fix possible crash on mgmt_index_removed

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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: 7cf5c2978f ("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>
This commit is contained in:
Luiz Augusto von Dentz 2024-09-12 12:34:42 -04:00
parent d505d3593b
commit f53e1c9c72
1 changed files with 14 additions and 9 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

23
net/bluetooth/mgmt.c
View file

@ -1453,10 +1453,15 @@ 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;
cmd->cmd_complete(cmd, *status);
/* 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);
if (cmd->cmd_complete) {
cmd->cmd_complete(cmd, match->mgmt_status);
mgmt_pending_remove(cmd);
return;
@ -9394,12 +9399,12 @@ 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,
@ -9450,7 +9455,7 @@ 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);
@ -9462,11 +9467,11 @@ 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,