Re: [PATCH] kvm: check dev parameter when updating msi route

["Radim Krčmář" <rkrcmar@redhat.com>]

This should primarily go to the qemu devel list.  I've Cc'd it, but
reposting would be safer, thanks.


2018-02-02 10:21+0530, P J P:
> From: Prasad J Pandit <pjp@fedoraproject.org>
> 
> When updating message signalled interrupt(MSI) route in routine
> kvm_irqchip_update_msi_route, device parameter could be null.
> Add check to avoid null dereference.
> 
> Reported-by: Guoxiang Niu <niuguoxiang@huawei.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
>  accel/kvm/kvm-all.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index f290f487a5..cb7613d282 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -1167,7 +1167,7 @@ int kvm_irqchip_add_msi_route(KVMState *s, int vector, PCIDevice *dev)
>      kroute.u.msi.address_lo = (uint32_t)msg.address;
>      kroute.u.msi.address_hi = msg.address >> 32;
>      kroute.u.msi.data = le32_to_cpu(msg.data);
> -    if (pci_available && kvm_msi_devid_required()) {
> +    if (pci_available && dev && kvm_msi_devid_required()) {
>          kroute.flags = KVM_MSI_VALID_DEVID;
>          kroute.u.msi.devid = pci_requester_id(dev);
>      }
> @@ -1205,7 +1205,7 @@ int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
>      kroute.u.msi.address_lo = (uint32_t)msg.address;
>      kroute.u.msi.address_hi = msg.address >> 32;
>      kroute.u.msi.data = le32_to_cpu(msg.data);
> -    if (pci_available && kvm_msi_devid_required()) {
> +    if (pci_available && dev && kvm_msi_devid_required()) {
>          kroute.flags = KVM_MSI_VALID_DEVID;
>          kroute.u.msi.devid = pci_requester_id(dev);
>      }
> -- 
> 2.14.3
>