[SRU][M][PATCH 0/1] CVE-2024-26801

[Bethany Jamison]

[Impact]

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

 Bluetooth: Avoid potential use-after-free in hci_error_reset

 While handling the HCI_EV_HARDWARE_ERROR event, if the underlying
 BT controller is not responding, the GPIO reset mechanism would
 free the hci_dev and lead to a use-after-free in hci_error_reset.

 Here's the call trace observed on a ChromeOS device with Intel AX201:
    queue_work_on+0x3e/0x6c
    __hci_cmd_sync_sk+0x2ee/0x4c0 [bluetooth <HASH:3b4a6>]
    ? init_wait_entry+0x31/0x31
    __hci_cmd_sync+0x16/0x20 [bluetooth <HASH:3b4a 6>]
    hci_error_reset+0x4f/0xa4 [bluetooth <HASH:3b4a 6>]
    process_one_work+0x1d8/0x33f
    worker_thread+0x21b/0x373
    kthread+0x13a/0x152
    ? pr_cont_work+0x54/0x54
    ? kthread_blkcg+0x31/0x31
     ret_from_fork+0x1f/0x30

 This patch holds the reference count on the hci_dev while processing
 a HCI_EV_HARDWARE_ERROR event to avoid potential crash.

[Fix]

Mantic:	Clean cherry-pick from linux-6.6.y
Jammy:	fixed via stable team
Focal:	pending
Bionic:	fix sent to esm ML
Xenial:	fix sent to esm ML
Trusty:	not-affected

[Test Case]

Compile and boot tested.

[Where problems could occur]

This fix affects those who use bluetooth when HCI (host controller
interface) is handling a connection error, an issue with this fix
would be visable to the user via data corruption or even a system
crash.

Ying Hsu (1):
  Bluetooth: Avoid potential use-after-free in hci_error_reset

 net/bluetooth/hci_core.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

-- 
2.34.1