title: Bluetooth: Avoid potential use-after-free in hci_error_reset
description: 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.
affected:
{
product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: c7741d16a57c, lessThan: e0b278650f07, status: affected, versionType: git
version: c7741d16a57c, lessThan: 98fb98fd37e4, status: affected, versionType: git
version: c7741d16a57c, lessThan: 6dd0a9dfa99f, status: affected, versionType: git
version: c7741d16a57c, lessThan: da4569d450b1, status: affected, versionType: git
version: c7741d16a57c, lessThan: 45085686b955, status: affected, versionType: git
version: c7741d16a57c, lessThan: 2ab9a19d896f, status: affected, versionType: git
version: c7741d16a57c, lessThan: dd594cdc24f2, status: affected, versionType: git
version: c7741d16a57c, lessThan: 2449007d3f73, status: affected, versionType: git
}
{
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions:
version: 4.0, status: affected
version: 0, lessThan: 4.0, status: unaffected, versionType: custom
version: 4.19.309, lessThanOrEqual: 4.19.*, status: unaffected, versionType: custom
version: 5.4.271, lessThanOrEqual: 5.4.*, status: unaffected, versionType: custom
version: 5.10.212, lessThanOrEqual: 5.10.*, status: unaffected, versionType: custom
version: 5.15.151, lessThanOrEqual: 5.15.*, status: unaffected, versionType: custom
version: 6.1.81, lessThanOrEqual: 6.1.*, status: unaffected, versionType: custom
version: 6.6.21, lessThanOrEqual: 6.6.*, status: unaffected, versionType: custom
version: 6.7.9, lessThanOrEqual: 6.7.*, status: unaffected, versionType: custom
version: 6.8, lessThanOrEqual: *, status: unaffected, versionType: original_commit_for_fix
}
