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From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
To: phasta@mailbox.org, malhyuk97@gmail.com, tursulin@ursulin.net,
	matthew.brost@intel.com, dakr@kernel.org
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	mdaenzer@redhat.com, alessio.belle@imgtec.com,
	luigi.santivetti@imgtec.com
Subject: Fix dma_fence use after free regression
Date: Wed,  9 Sep 2026 15:14:22 +0200	[thread overview]
Message-ID: <20260909131808.2201-1-christian.koenig@amd.com> (raw)

Hi everyone,

as discussed in a separate thread Jonghyuk Kim(MalHyuk) stumbled over an
use after free which we through should have already been fixed last
year.

Turned out that a recent patch regressed that by limiting the check to
the ops pointer instead of checking both ops and signaling status of a
dma_fence.

Fix this and also add a few lines of comments to drm_sched_fini() to
document the necessity of an RCU barriere after signaling the last
drm_sched_fence object.

Please review and comment,
Christian.


             reply	other threads:[~2026-09-09 13:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-09 13:14 Christian König [this message]
2026-09-09 13:14 ` [PATCH 1/2] dma-buf/dma-fence: fix checking signaling bit for timeline and driver name Christian König
2026-09-09 13:58   ` Philipp Stanner
2026-09-09 13:14 ` [PATCH 2/2] drm/sched: document the RCU dependency Christian König
2026-09-09 13:55   ` Philipp Stanner
2026-09-09 13:57     ` Christian König

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