Description
In the Linux kernel, the following vulnerability has been resolved: block: stop the timeout timer when releasing a never added disk disk_release() undoes blk_mq_init_allocated_queue() for a disk whose probe failed before add_disk(), but it only calls blk_mq_exit_queue(). Nothing there stops q->timeout, and that timer rolls forward: it stays pending until it next expires, not until the last request completes. So if the driver issued any I/O before adding the disk, the request_queue is freed while still linked into a timer wheel bucket. Commit 6f8191fdf41d ("block: simplify disk shutdown") dropped the blk_cleanup_queue() call that used to stop it. __del_gendisk() and blk_mq_destroy_queue() still do; only the probe failure path lost it. nvme gets there because nvme_update_ns_info() submits Report Zones or FDP io-mgmt-recv on ns->queue before the disk is added, so a later failure - a concurrent reset setting NVME_CTRL_FROZEN, or device_add_disk() failing - lands in put_disk() with the timer armed: BUG: KASAN: slab-use-after-free in detach_if_pending+0x30c/0x340 Write of size 8 at addr ffff888004d71310 by task kworker/u8:2/37 __timer_delete_sync+0x156/0x240 kernel/time/timer.c:1621 blk_sync_queue+0x22/0x40 block/blk-core.c:222 nvme_sync_queues+0x100/0x150 drivers/nvme/host/core.c:5362 nvme_reset_work+0x138/0x930 drivers/nvme/host/pci.c:3264 Allocated by task 34: __blk_mq_alloc_disk+0x33/0x100 block/blk-mq.c:4462 nvme_alloc_ns+0x290/0x3870 drivers/nvme/host/core.c:4146 Freed by task 0: blk_free_queue_rcu+0x3a/0x50 block/blk-core.c:254 rcu_core+0xc10/0x1730 kernel/rcu/tree.c:2857 The queue being synced there is ctrl->admin_q, only a victim sharing a timer wheel bucket with the freed queue's dangling entry; other runs tripped in enqueue_timer(), __run_timers() or blk_mq_timeout_work(). Failing nvme_alloc_ns() with a debug patch makes it deterministic: one leaked timer trips KASAN within seconds, while 1987 patched releases produced no splat. Stop the timer and the queue work items before blk_mq_exit_queue(), like blk_mq_destroy_queue() does. Found by FuzzNvme.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < 6ae7364f68e6c7af6b6df4bbb14040b89e5975d0affected6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < 6f06dbe5012c160e0dba418a5a9cb16c456ad46aaffected6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < 1a0ae4d502062a2759f2a92d12bdeab3c64c7372affected6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < bb03b56d1d754908a37a160603be21769da423cfaffected6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < 93d620519d71dfc6ee64b5baea74f1d85d4439fbaffected6f8191fdf41d3a53cc1d63fe2234e812c55a0092 to < 26cb8ebbfaf713c82e142d08828d4d765057633baffectedd27b66257db183fe11c10f31246ae965adb005d3affected5.19.12 to < 5.20affected
Linux Linux
Default version status: affected
6.0affected0 to < 6.0unaffected6.1.184 to ≤ 6.1.*unaffected6.6.153 to ≤ 6.6.*unaffected6.12.105 to ≤ 6.12.*unaffected6.18.46 to ≤ 6.18.*unaffected7.1.10 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6ae7364f68e6c7af6b6df4bbb14040b89e5975d0 ↗
- https://git.kernel.org/stable/c/6f06dbe5012c160e0dba418a5a9cb16c456ad46a ↗
- https://git.kernel.org/stable/c/1a0ae4d502062a2759f2a92d12bdeab3c64c7372 ↗
- https://git.kernel.org/stable/c/bb03b56d1d754908a37a160603be21769da423cf ↗
- https://git.kernel.org/stable/c/93d620519d71dfc6ee64b5baea74f1d85d4439fb ↗
- https://git.kernel.org/stable/c/26cb8ebbfaf713c82e142d08828d4d765057633b ↗