Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.10 40/51] nvmet-rdma: Fix list_del corruption on queue establishment failure | Date | Tue, 12 Jan 2021 07:55:22 -0500 |
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From: Israel Rukshin <israelr@nvidia.com>
[ Upstream commit 9ceb7863537748c67fa43ac4f2f565819bbd36e4 ]
When a queue is in NVMET_RDMA_Q_CONNECTING state, it may has some requests at rsp_wait_list. In case a disconnect occurs at this state, no one will empty this list and will return the requests to free_rsps list. Normally nvmet_rdma_queue_established() free those requests after moving the queue to NVMET_RDMA_Q_LIVE state, but in this case __nvmet_rdma_queue_disconnect() is called before. The crash happens at nvmet_rdma_free_rsps() when calling list_del(&rsp->free_list), because the request exists only at the wait list. To fix the issue, simply clear rsp_wait_list when destroying the queue.
Signed-off-by: Israel Rukshin <israelr@nvidia.com> Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/nvme/target/rdma.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 5c1e7cb7fe0de..bdfc22eb2a10f 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -1641,6 +1641,16 @@ static void __nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue) spin_lock_irqsave(&queue->state_lock, flags); switch (queue->state) { case NVMET_RDMA_Q_CONNECTING: + while (!list_empty(&queue->rsp_wait_list)) { + struct nvmet_rdma_rsp *rsp; + + rsp = list_first_entry(&queue->rsp_wait_list, + struct nvmet_rdma_rsp, + wait_list); + list_del(&rsp->wait_list); + nvmet_rdma_put_rsp(rsp); + } + fallthrough; case NVMET_RDMA_Q_LIVE: queue->state = NVMET_RDMA_Q_DISCONNECTING; disconnect = true; -- 2.27.0
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