🛡️ CVE-2025-68203 — kernel

drm/amdgpu: fix lock warning in amdgpu_userq_fence_driver_process

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

drm/amdgpu: fix lock warning in amdgpu_userq_fence_driver_process

Fix a potential deadlock caused by inconsistent spinlock usage

between interrupt and process contexts in the userq fence driver.

The issue occurs when amdgpu_userq_fence_driver_process() is called

from both:

• Interrupt context: gfx_v11_0_eop_irq() -> amdgpu_userq_fence_driver_process()
• Process context: amdgpu_eviction_fence_suspend_worker() ->

amdgpu_userq_fence_driver_force_completion() -> amdgpu_userq_fence_driver_process()

In interrupt context, the spinlock was acquired without disabling

interrupts, leaving it in {IN-HARDIRQ-W} state. When the same lock

is acquired in process context, the kernel detects inconsistent

locking since the process context acquisition would enable interrupts

while holding a lock previously acquired in interrupt context.

Kernel log shows:

[ 4039.310790] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.

[ 4039.310804] kworker/7:2/409 [HC0[0]:SC0[0]:HE1:SE1] takes:

[ 4039.310818] ffff9284e1bed000 (&fence_drv->fence_list_lock){?...}-{3:3},

[ 4039.310993] {IN-HARDIRQ-W} state was registered at:

[ 4039.311004] lock_acquire+0xc6/0x300

[ 4039.311018] _raw_spin_lock+0x39/0x80

[ 4039.311031] amdgpu_userq_fence_driver_process.part.0+0x30/0x180 [amdgpu]

[ 4039.311146] amdgpu_userq_fence_driver_process+0x17/0x30 [amdgpu]

[ 4039.311257] gfx_v11_0_eop_irq+0x132/0x170 [amdgpu]

Fix by using spin_lock_irqsave()/spin_unlock_irqrestore() to properly

manage interrupt state regardless of calling context.

(cherry picked from commit ded3ad780cf97a04927773c4600823b84f7f3cc2)