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nvmet: pci-epf: put CQ ref on create_cq mapping failure

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nvmet_pci_epf_create_cq() calls nvmet_cq_create(), which takes a
reference on the controller and installs the completion queue. If the
subsequent PCI address-space mapping fails or returns a too-small partial
mapping, the function jumps to err_internal / err_unmap_queue without
calling nvmet_cq_put(). The matching put in nvmet_pci_epf_delete_cq() is
gated on NVMET_PCI_EPF_Q_LIVE, which is only set after the mapping
succeeds, so teardown never releases these references. A remote PCI host
that drives Create IO CQ commands with a failing PRP1/pci_addr therefore
leaks the CQ and a controller reference on each attempt.

Drop the CQ reference on the mapping-failure paths. The err_internal and
err_unmap_queue labels are only reachable after nvmet_cq_create() has
succeeded, so this pairs the create/put correctly.

Fixes: 0faa0fe6f9 ("nvmet: New NVMe PCI endpoint function target driver")
Cc: stable@vger.kernel.org
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Yifei Gao <gyf161023@gmail.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Yifei Gao
2026-08-04 21:36:25 +00:00
committed by Keith Busch
parent 8ce883fd06
commit 659ae9d02c
1 changed files with 1 additions and 0 deletions
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1
drivers/nvme/target/pci-epf.c
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@@ -1339,6 +1339,7 @@ static u16 nvmet_pci_epf_create_cq(struct nvmet_ctrl *tctrl,
nvmet_pci_epf_mem_unmap(ctrl->nvme_epf, &cq->pci_map);
err_internal:
status = NVME_SC_INTERNAL | NVME_STATUS_DNR;
nvmet_cq_put(&cq->nvme_cq);
err:
if (test_and_clear_bit(NVMET_PCI_EPF_Q_IRQ_ENABLED, &cq->flags))
nvmet_pci_epf_remove_irq_vector(ctrl, cq->vector);