nvme-pci: Fix memory leak on probe failure

The nvme driver specific structures need to be initialized prior to enabling the generic controller so we can unwind on failure with out using the reference counting callbacks so that 'probe' and 'remove' can be symmetric.

The newly added iod_mempool is the only resource that was being allocated out of order, and a failure there would leak the generic controller memory. This patch just moves that allocation above the controller initialization.

Fixes 943e942e6266f ("nvme-pci: limit max IO size and segments to avoid high order allocations")

Reported-by Weiping Zhang <zwp10758 at gmail.com>

Signed-off-by Keith Busch <keith.busch at intel.com>

---
 drivers/nvme/host/pci.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

drivers/nvme/host/pci.c +7 -5

index ba943f211687..ddd441b1516a 100644
@@ -2556,11 +2556,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	quirks |= check_vendor_combination_bug(pdev);
 
-	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
-			quirks);
-	if (result)
-		goto release_pools;
-
 	/*
 	 * Double check that our mempool alloc size will cover the biggest
 	 * command we support.

@@ -2578,6 +2573,11 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto release_pools;
 	}
 
+	result = nvme_init_ctrl(&dev->ctrl, &pdev->dev, &nvme_pci_ctrl_ops,
+			quirks);
+	if (result)
+		goto release_mempool;
+
 	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
 
 	nvme_get_ctrl(&dev->ctrl);

@@ -2585,6 +2585,8 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 
 	return 0;
 
+ release_mempool:
+	mempool_destroy(dev->iod_mempool);
  release_pools:
 	nvme_release_prp_pools(dev);
  unmap:

Signature · 1 line

2.14.3