From ff9fc7ebf5c06de1ef72a69f9b1ab40af8b07f9e Mon Sep 17 00:00:00 2001 From: Sagi Grimberg Date: Tue, 1 Feb 2022 14:54:20 +0200 Subject: nvme-tcp: fix possible use-after-free in transport error_recovery work While nvme_tcp_submit_async_event_work is checking the ctrl and queue state before preparing the AER command and scheduling io_work, in order to fully prevent a race where this check is not reliable the error recovery work must flush async_event_work before continuing to destroy the admin queue after setting the ctrl state to RESETTING such that there is no race .submit_async_event and the error recovery handler itself changing the ctrl state. Tested-by: Chris Leech Signed-off-by: Sagi Grimberg --- drivers/nvme/host/tcp.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers') diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c index 4ceb28675fdf..01e24b5703db 100644 --- a/drivers/nvme/host/tcp.c +++ b/drivers/nvme/host/tcp.c @@ -2096,6 +2096,7 @@ static void nvme_tcp_error_recovery_work(struct work_struct *work) struct nvme_ctrl *ctrl = &tcp_ctrl->ctrl; nvme_stop_keep_alive(ctrl); + flush_work(&ctrl->async_event_work); nvme_tcp_teardown_io_queues(ctrl, false); /* unquiesce to fail fast pending requests */ nvme_start_queues(ctrl); -- cgit v1.2.3