drm/panthor: Fix UAF race between device unplug and FW event processing

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[ Upstream commit 7051f6ba96 ]

The function panthor_fw_unplug() will free the FW memory sections.
The problem is that there could still be pending FW events which are yet
not handled at this point. process_fw_events_work() can in this case try
to access said freed memory.

Simply call disable_work_sync() to both drain and prevent future
invocation of process_fw_events_work().

Signed-off-by: Ketil Johnsen <ketil.johnsen@arm.com>
Fixes: de85488138 ("drm/panthor: Add the scheduler logical block")
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20251027140217.121274-1-ketil.johnsen@arm.com
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ketil Johnsen 2025-10-27 15:02:15 +01:00 • committed by Greg Kroah-Hartman

parent 1ed88300c3

commit 31db188355

1 changed files with 1 additions and 0 deletions

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drivers/gpu/drm/panthor/panthor_sched.c

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