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drm/i915/gt: Empty uabi engines list during intel_engines_release()

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While the uabi_engines_llist is populated in intel_engines_init() during
driver load, the corresponding function intel_engines_release() does not
correctly get rid of it. This can lead to a UAF if, after failed
initialization (for example when gt is set wedged on init), we try to
access the engines.

Suggested-by: Chris Wilson <chris.p.wilson@linux.intel.com>
Signed-off-by: Krzysztof Niemiec <krzysztof.niemiec@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240801154047.115176-2-krzysztof.niemiec@intel.com
This commit is contained in:
Krzysztof Niemiec 2024-08-01 17:40:48 +02:00 committed by Andi Shyti
parent 843f10ce65
commit fceff12e52
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/i915/gt/intel_engine_cs.c
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@ -693,6 +693,8 @@ void intel_engines_release(struct intel_gt *gt)
memset(&engine->reset, 0, sizeof(engine->reset));
}
llist_del_all(&gt->i915->uabi_engines_llist);
}
void intel_engine_free_request_pool(struct intel_engine_cs *engine)