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

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[ Upstream commit de6dfcefd1 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Douglas Anderson 2023-06-30 15:33:14 -07:00 • committed by Greg Kroah-Hartman

parent e969bfed84

commit 0d4d6b083d

1 changed files with 3 additions and 1 deletions

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net/bluetooth/hci_core.c

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