linux-kernel - [PATCH 5.4 260/340] drm/sched: Cancel and flush all outstanding jobs before finish.

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Message-Id: <20210301161101.099905354@linuxfoundation.org>
Date:   Mon,  1 Mar 2021 17:13:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        Christian König <christian.koenig@....com>
Subject: [PATCH 5.4 260/340] drm/sched: Cancel and flush all outstanding jobs before finish.

From: Andrey Grodzovsky <andrey.grodzovsky@....com>

commit e582951baabba3e278c97169d0acc1e09b24a72e upstream.

To avoid any possible use after free.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@....com>
Reviewed-by: Christian König <christian.koenig@....com>
Link: https://patchwork.freedesktop.org/patch/414814/
CC: stable@...r.kernel.org
Signed-off-by: Christian König <christian.koenig@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/scheduler/sched_main.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -851,6 +851,9 @@ void drm_sched_fini(struct drm_gpu_sched
 	if (sched->thread)
 		kthread_stop(sched->thread);
 
+	/* Confirm no work left behind accessing device structures */
+	cancel_delayed_work_sync(&sched->work_tdr);
+
 	sched->ready = false;
 }
 EXPORT_SYMBOL(drm_sched_fini);