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drm/panthor: Reset the FW VM to NULL on unplug

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This way get NULL derefs instead of use-after-free if the FW VM is
referenced after the device has been unplugged.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240502183813.1612017-4-boris.brezillon@collabora.com
This commit is contained in:
Boris Brezillon 2024-05-02 20:38:11 +02:00
parent ff60c8da0a
commit a257e81822
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/panthor/panthor_fw.c
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@ -1142,6 +1142,7 @@ void panthor_fw_unplug(struct panthor_device *ptdev)
* state to keep the active_refcnt balanced.
*/
panthor_vm_put(ptdev->fw->vm);
ptdev->fw->vm = NULL;
panthor_gpu_power_off(ptdev, L2, ptdev->gpu_info.l2_present, 20000);
}