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nvme-rdma: fix possible double free of controller async event buffer 

If reconnect/reset failed where the controller async event buffer
was freed, we might end up freeing it again as we call
nvme_rdma_destroy_admin_queue again in the remove path. Given that
the sequence is guaranteed to serialize by .ctrl_stop, we simply
set ctrl->async_event_sqe.data to NULL and don't free it in future
visits.

Reported-by: Max Gurtovoy <maxg@mellanox.com>
Tested-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>
hifive-unleashed-5.1
Sagi Grimberg 2018-06-25 20:58:17 +03:00 committed by Christoph Hellwig
parent 15bfd21fbc
commit 682630f00a
1 changed files with 5 additions and 2 deletions
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7
drivers/nvme/host/rdma.c
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@ -732,8 +732,11 @@ static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl,
blk_cleanup_queue(ctrl->ctrl.admin_q);
nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset);
}
nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
sizeof(struct nvme_command), DMA_TO_DEVICE);
if (ctrl->async_event_sqe.data) {
nvme_rdma_free_qe(ctrl->device->dev, &ctrl->async_event_sqe,
sizeof(struct nvme_command), DMA_TO_DEVICE);
ctrl->async_event_sqe.data = NULL;
}
nvme_rdma_free_queue(&ctrl->queues[0]);
}