27 lines
1022 B
Diff
27 lines
1022 B
Diff
From a257e8182261da48b7c34615f2752f8a78ac108b Mon Sep 17 00:00:00 2001
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From: Boris Brezillon <boris.brezillon@collabora.com>
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Date: Thu, 2 May 2024 20:38:11 +0200
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Subject: [PATCH] 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
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referenced after the device has been unplugged.
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Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
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Reviewed-by: Steven Price <steven.price@arm.com>
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Acked-by: Liviu Dudau <liviu.dudau@arm.com>
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Link: https://patchwork.freedesktop.org/patch/msgid/20240502183813.1612017-4-boris.brezillon@collabora.com
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---
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drivers/gpu/drm/panthor/panthor_fw.c | 1 +
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1 file changed, 1 insertion(+)
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--- a/drivers/gpu/drm/panthor/panthor_fw.c
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+++ b/drivers/gpu/drm/panthor/panthor_fw.c
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@@ -1142,6 +1142,7 @@ void panthor_fw_unplug(struct panthor_de
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* state to keep the active_refcnt balanced.
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*/
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panthor_vm_put(ptdev->fw->vm);
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+ ptdev->fw->vm = NULL;
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panthor_gpu_power_off(ptdev, L2, ptdev->gpu_info.l2_present, 20000);
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}
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