CVE-2024-39282

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

net: wwan: t7xx: Fix FSM command timeout issue

When driver processes the internal state change command, it use an

asynchronous thread to process the command operation. If the main

thread detects that the task has timed out, the asynchronous thread

will panic when executing the completion notification because the

main thread completion object has been released.

BUG: unable to handle page fault for address: fffffffffffffff8

PGD 1f283a067 P4D 1f283a067 PUD 1f283c067 PMD 0

Oops: 0000 [#1] PREEMPT SMP NOPTI

RIP: 0010:complete_all+0x3e/0xa0

[...]

Call Trace:

<TASK>

? __die_body+0x68/0xb0

? page_fault_oops+0x379/0x3e0

? exc_page_fault+0x69/0xa0

? asm_exc_page_fault+0x22/0x30

? complete_all+0x3e/0xa0

fsm_main_thread+0xa3/0x9c0 [mtk_t7xx (HASH:1400 5)]

? __pfx_autoremove_wake_function+0x10/0x10

kthread+0xd8/0x110

? __pfx_fsm_main_thread+0x10/0x10 [mtk_t7xx (HASH:1400 5)]

? __pfx_kthread+0x10/0x10

ret_from_fork+0x38/0x50

? __pfx_kthread+0x10/0x10

ret_from_fork_asm+0x1b/0x30

</TASK>

[...]

CR2: fffffffffffffff8

---[ end trace 0000000000000000 ]---

Use the reference counter to ensure safe release as Sergey suggests:

https://lore.kernel.org/all/[email protected]/