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PCI: hv: Fix a use-after-free bug in hv_eject_device_work() 

Fix a use-after-free in hv_eject_device_work().

Fixes: 05f151a73e ("PCI: hv: Fix a memory leak in hv_eject_device_work()")
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Dexuan Cui 2019-06-21 23:45:23 +00:00 committed by Lorenzo Pieralisi
parent a188339ca5
commit 4df591b20b
1 changed files with 9 additions and 6 deletions
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15
drivers/pci/controller/pci-hyperv.c
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@ -1875,6 +1875,7 @@ static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
static void hv_eject_device_work(struct work_struct *work)
{
struct pci_eject_response *ejct_pkt;
struct hv_pcibus_device *hbus;
struct hv_pci_dev *hpdev;
struct pci_dev *pdev;
unsigned long flags;
@ -1885,6 +1886,7 @@ static void hv_eject_device_work(struct work_struct *work)
} ctxt;
hpdev = container_of(work, struct hv_pci_dev, wrk);
hbus = hpdev->hbus;
WARN_ON(hpdev->state != hv_pcichild_ejecting);
@ -1895,8 +1897,7 @@ static void hv_eject_device_work(struct work_struct *work)
* because hbus->pci_bus may not exist yet.
*/
wslot = wslot_to_devfn(hpdev->desc.win_slot.slot);
pdev = pci_get_domain_bus_and_slot(hpdev->hbus->sysdata.domain, 0,
wslot);
pdev = pci_get_domain_bus_and_slot(hbus->sysdata.domain, 0, wslot);
if (pdev) {
pci_lock_rescan_remove();
pci_stop_and_remove_bus_device(pdev);
@ -1904,9 +1905,9 @@ static void hv_eject_device_work(struct work_struct *work)
pci_unlock_rescan_remove();
}
spin_lock_irqsave(&hpdev->hbus->device_list_lock, flags);
spin_lock_irqsave(&hbus->device_list_lock, flags);
list_del(&hpdev->list_entry);
spin_unlock_irqrestore(&hpdev->hbus->device_list_lock, flags);
spin_unlock_irqrestore(&hbus->device_list_lock, flags);
if (hpdev->pci_slot)
pci_destroy_slot(hpdev->pci_slot);
@ -1915,7 +1916,7 @@ static void hv_eject_device_work(struct work_struct *work)
ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message;
ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE;
ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot;
vmbus_sendpacket(hpdev->hbus->hdev->channel, ejct_pkt,
vmbus_sendpacket(hbus->hdev->channel, ejct_pkt,
sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
VM_PKT_DATA_INBAND, 0);
@ -1924,7 +1925,9 @@ static void hv_eject_device_work(struct work_struct *work)
/* For the two refs got in new_pcichild_device() */
put_pcichild(hpdev);
put_pcichild(hpdev);
put_hvpcibus(hpdev->hbus);
/* hpdev has been freed. Do not use it any more. */
put_hvpcibus(hbus);
}
/**