Sagi Grimberg a25e460fbb nvme: fix a possible use-after-free in controller reset during load ... [ Upstream commit 0fa0f99fc84e41057cbdd2efbfe91c6b2f47dd9d ] Unlike .queue_rq, in .submit_async_event drivers may not check the ctrl readiness for AER submission. This may lead to a use-after-free condition that was observed with nvme-tcp. The race condition may happen in the following scenario: 1. driver executes its reset_ctrl_work 2. -> nvme_stop_ctrl - flushes ctrl async_event_work 3. ctrl sends AEN which is received by the host, which in turn schedules AEN handling 4. teardown admin queue (which releases the queue socket) 5. AEN processed, submits another AER, calling the driver to submit 6. driver attempts to send the cmd ==> use-after-free In order to fix that, add ctrl state check to validate the ctrl is actually able to accept the AER submission. This addresses the above race in controller resets because the driver during teardown should: 1. change ctrl state to RESETTING 2. flush async_event_work (as well as other async work elements) So after 1,2, any other AER command will find the ctrl state to be RESETTING and bail out without submitting the AER. Signed-off-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-02-23 11:58:38 +01:00
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host	nvme: fix a possible use-after-free in controller reset during load	2022-02-23 11:58:38 +01:00
target	nvme-loop: check for NVME_LOOP_Q_LIVE in nvme_loop_destroy_admin_queue()	2021-06-30 08:48:12 -04:00
Kconfig	nvme: use menu Kconfig interface	2017-10-04 09:43:57 +02:00
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