[dpdk-dev] [PATCH] bus/pci: fix use after free on unplug

[David Marchand]

rte_pci_unmap_device() needs intr_handle objects to unregister
callbacks.

Bugzilla ID: 845
Fixes: d61138d4f0e2 ("drivers: remove direct access to interrupt handle")

Signed-off-by: David Marchand <david.march...@redhat.com>
---
 drivers/bus/pci/pci_common.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index f8fff2c98e..4a3a87f24f 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -271,10 +271,6 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
                return ret; /* no rollback if already succeeded earlier */
        if (ret) {
                dev->driver = NULL;
-               rte_intr_instance_free(dev->vfio_req_intr_handle);
-               dev->vfio_req_intr_handle = NULL;
-               rte_intr_instance_free(dev->intr_handle);
-               dev->intr_handle = NULL;
                if ((dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) &&
                        /* Don't unmap if device is unsupported and
                         * driver needs mapped resources.
@@ -282,6 +278,10 @@ rte_pci_probe_one_driver(struct rte_pci_driver *dr,
                        !(ret > 0 &&
                                (dr->drv_flags & RTE_PCI_DRV_KEEP_MAPPED_RES)))
                        rte_pci_unmap_device(dev);
+               rte_intr_instance_free(dev->vfio_req_intr_handle);
+               dev->vfio_req_intr_handle = NULL;
+               rte_intr_instance_free(dev->intr_handle);
+               dev->intr_handle = NULL;
        } else {
                dev->device.driver = &dr->driver;
        }
@@ -322,15 +322,16 @@ rte_pci_detach_dev(struct rte_pci_device *dev)
        /* clear driver structure */
        dev->driver = NULL;
        dev->device.driver = NULL;
-       rte_intr_instance_free(dev->intr_handle);
-       dev->intr_handle = NULL;
-       rte_intr_instance_free(dev->vfio_req_intr_handle);
-       dev->vfio_req_intr_handle = NULL;
 
        if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)
                /* unmap resources for devices that use igb_uio */
                rte_pci_unmap_device(dev);
 
+       rte_intr_instance_free(dev->intr_handle);
+       dev->intr_handle = NULL;
+       rte_intr_instance_free(dev->vfio_req_intr_handle);
+       dev->vfio_req_intr_handle = NULL;
+
        return 0;
 }
 
-- 
2.23.0