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Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()

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KASAN reports that there's a use-after-free in
hci_remove_adv_monitor(). Trawling through the disassembly, you can
see that the complaint is from the access in bt_dev_dbg() under the
HCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because
msft_remove_monitor() can end up freeing the monitor
structure. Specifically:
  hci_remove_adv_monitor() ->
  msft_remove_monitor() ->
  msft_remove_monitor_sync() ->
  msft_le_cancel_monitor_advertisement_cb() ->
  hci_free_adv_monitor()

Let's fix the problem by just stashing the relevant data when it's
still valid.

Fixes: 7cf5c2978f ("Bluetooth: hci_sync: Refactor remove Adv Monitor")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Douglas Anderson 2023-06-30 15:33:14 -07:00 committed by Luiz Augusto von Dentz
parent 6910e2eb39
commit de6dfcefd1
1 changed files with 3 additions and 1 deletions
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4
net/bluetooth/hci_core.c
View File

@ -1972,6 +1972,7 @@ static int hci_remove_adv_monitor(struct hci_dev *hdev,
struct adv_monitor *monitor)
{
int status = 0;
int handle;
switch (hci_get_adv_monitor_offload_ext(hdev)) {
case HCI_ADV_MONITOR_EXT_NONE: /* also goes here when powered off */
@ -1980,9 +1981,10 @@ static int hci_remove_adv_monitor(struct hci_dev *hdev,
goto free_monitor;
case HCI_ADV_MONITOR_EXT_MSFT:
handle = monitor->handle;
status = msft_remove_monitor(hdev, monitor);
bt_dev_dbg(hdev, "%s remove monitor %d msft status %d",
hdev->name, monitor->handle, status);
hdev->name, handle, status);
break;
}