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Change History

In the Linux kernel, the following vulnerability has been resolved:

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

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.

https://git.kernel.org/stable/c/0d4d6b083da9b033ddccef72d77f373c819ae3ea

https://git.kernel.org/stable/c/bf00c2c8f6254f44ac041aa9a311ae9e0caf692b

https://git.kernel.org/stable/c/de6dfcefd107667ce2dbedf4d9337f5ed557a4a1