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| author | Sagi Grimberg <sagi@grimberg.me> | 2018-06-25 20:58:17 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2018-06-28 16:29:54 +0200 |
| commit | 682630f00a219a1b0696abe9c0967e660068187b (patch) | |
| tree | 43a225e137266a0943308eca09fdfd62acf6638e /drivers/nvme | |
| parent | 15bfd21fbc5d35834b9ea383dc458a1f0c9e3434 (diff) | |
| download | linux-stable-682630f00a219a1b0696abe9c0967e660068187b.tar.gz linux-stable-682630f00a219a1b0696abe9c0967e660068187b.tar.bz2 linux-stable-682630f00a219a1b0696abe9c0967e660068187b.zip | |
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>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/rdma.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 9544625c0b7d..518c5b09038c 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -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]); } |