> On Feb 10, 2022, at 2:27 PM, Christophe JAILLET <christophe.jaillet@xxxxxxxxxx> wrote:
>
> The 'err_remove_vmci_dev_g' error label is not at the right place.
> This could lead to un-released resource.
>
> There is also a missing label. If pci_alloc_irq_vectors() fails, the
> previous vmci_event_subscribe() call must be undone.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Thanks for the patch!
Let's deal with the points which Dan brought up separately.
Acked-by: Vishnu Dasa <vdasa@xxxxxxxxxx>
> ---
> Review with GREAT care.
>
> This patch is a recent rebase of an old patch that has never been
> submitted.
> This function is huge and modifying its error handling path is error
> prone (at least for me).
>
> The patch is compile-tested only.
> ---
> drivers/misc/vmw_vmci/vmci_guest.c | 18 +++++++++---------
> 1 file changed, 9 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c
> index 02d4722d8474..2e8ad36895ae 100644
> --- a/drivers/misc/vmw_vmci/vmci_guest.c
> +++ b/drivers/misc/vmw_vmci/vmci_guest.c
> @@ -765,7 +765,7 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
> /* Check host capabilities. */
> error = vmci_check_host_caps(pdev);
> if (error)
> - goto err_remove_bitmap;
> + goto err_remove_vmci_dev_g;
>
> /* Enable device. */
>
> @@ -795,7 +795,7 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
> error = pci_alloc_irq_vectors(pdev, 1, 1,
> PCI_IRQ_MSIX | PCI_IRQ_MSI | PCI_IRQ_LEGACY);
> if (error < 0)
> - goto err_remove_bitmap;
> + goto err_unsubscrive_event;
> } else {
> vmci_dev->exclusive_vectors = true;
> }
> @@ -871,13 +871,19 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
> err_disable_msi:
> pci_free_irq_vectors(pdev);
>
> +err_unsubscrive_event:
Please rename this to err_unsubscribe_event
> vmci_err = vmci_event_unsubscribe(ctx_update_sub_id);
> if (vmci_err < VMCI_SUCCESS)
> dev_warn(&pdev->dev,
> "Failed to unsubscribe from event (type=%d) with subscriber (ID=0x%x): %d\n",
> VMCI_EVENT_CTX_ID_UPDATE, ctx_update_sub_id, vmci_err);
>
> -err_remove_bitmap:
> +err_remove_vmci_dev_g:
> + spin_lock_irq(&vmci_dev_spinlock);
> + vmci_pdev = NULL;
> + vmci_dev_g = NULL;
> + spin_unlock_irq(&vmci_dev_spinlock);
> +
> if (vmci_dev->notification_bitmap) {
> vmci_write_reg(vmci_dev, VMCI_CONTROL_RESET, VMCI_CONTROL_ADDR);
> dma_free_coherent(&pdev->dev, PAGE_SIZE,
> @@ -885,12 +891,6 @@ static int vmci_guest_probe_device(struct pci_dev *pdev,
> vmci_dev->notification_base);
> }
>
> -err_remove_vmci_dev_g:
> - spin_lock_irq(&vmci_dev_spinlock);
> - vmci_pdev = NULL;
> - vmci_dev_g = NULL;
> - spin_unlock_irq(&vmci_dev_spinlock);
> -
> err_free_data_buffers:
> vmci_free_dg_buffers(vmci_dev);
>
> --
> 2.32.0
>
