https://bugs.launchpad.net/bugs/1646204 [PATCH 1/4] target/user: Use sense_reason_t in tcmu_queue_cmd_ring [PATCH 2/4] target/user: Return an error if cmd data size is too [PATCH 3/4] target/user: Fix comments to not refer to data ring [PATCH 4/4] UBUNTU: SAUCE: (no-up) target/user: Fix use-after-free of rtg