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[PULL,v2,13/38] virtio-iommu: Fix virtio_iommu_mr()

Message ID 20201104044937.226370-14-mst@redhat.com
State Superseded
Headers show
Series [PULL,v2,01/38] pc: comment style fixup | expand

Commit Message

Michael S. Tsirkin Nov. 4, 2020, 4:51 a.m. UTC 
From: Jean-Philippe Brucker <jean-philippe@linaro.org>

Due to an invalid mask, virtio_iommu_mr() may return the wrong memory
region. It hasn't been too problematic so far because the function was
only used to test existence of an endpoint, but that is about to change.

Fixes: cfb42188b24d ("virtio-iommu: Implement attach/detach command")
Cc: QEMU Stable <qemu-stable@nongnu.org>
Acked-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Message-Id: <20201030180510.747225-2-jean-philippe@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/virtio-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
index 21ec63b108..4c8f3909b7 100644
--- a/hw/virtio/virtio-iommu.c
+++ b/hw/virtio/virtio-iommu.c
@@ -101,7 +101,7 @@  static IOMMUMemoryRegion *virtio_iommu_mr(VirtIOIOMMU *s, uint32_t sid)
     bus_n = PCI_BUS_NUM(sid);
     iommu_pci_bus = iommu_find_iommu_pcibus(s, bus_n);
     if (iommu_pci_bus) {
-        devfn = sid & PCI_DEVFN_MAX;
+        devfn = sid & (PCI_DEVFN_MAX - 1);
         dev = iommu_pci_bus->pbdev[devfn];
         if (dev) {
             return &dev->iommu_mr;