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The valid event ids go from 0 to KFD_SIGNAL_EVENT_LIMIT allocate_event_notification_slot has an option to specify an event id to allocate at, used by CRIU. We weren't checking the bounds on that value. Check them. v2: Lower bounds check is unecessary because of idr_alloc already rejecting negative numbers. Upper bounds check should be KFD_SIGNAL_EVENT_LIMIT since the signal mode mappings might not yet exist Signed-off-by: David Francis <David.Francis@amd.com> Reviewed-by: David Yat Sin <david.yatsin@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 6853f1f6cbbeb3f53ebbbd7286536aeb2c5d5f50) Cc: stable@vger.kernel.org