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| author | Alex Williamson <alex.williamson@redhat.com> | 2013-03-26 11:33:16 -0600 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2013-03-26 11:33:16 -0600 |
| commit | 904c680c7bf016a8619a045850937427f8d7368c (patch) | |
| tree | c1f3e2c8ba7fb2e5f96070f8125003730a71d222 | |
| parent | 25e9789ddd9d14a8971f4a421d04f282719ab733 (diff) | |
| download | linux-next-904c680c7bf016a8619a045850937427f8d7368c.tar.gz | |
vfio-pci: Fix possible integer overflow
The VFIO_DEVICE_SET_IRQS ioctl takes a start and count parameter, both
of which are unsigned. We attempt to bounds check these, but fail to
account for the case where start is a very large number, allowing
start + count to wrap back into the valid range. Bounds check both
start and start + count.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
| -rw-r--r-- | drivers/vfio/pci/vfio_pci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index 8189cb6a86af..7abc5c81af2c 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -346,6 +346,7 @@ static long vfio_pci_ioctl(void *device_data, if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) { size_t size; + int max = vfio_pci_get_irq_count(vdev, hdr.index); if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL) size = sizeof(uint8_t); @@ -355,7 +356,7 @@ static long vfio_pci_ioctl(void *device_data, return -EINVAL; if (hdr.argsz - minsz < hdr.count * size || - hdr.count > vfio_pci_get_irq_count(vdev, hdr.index)) + hdr.start >= max || hdr.start + hdr.count > max) return -EINVAL; data = memdup_user((void __user *)(arg + minsz), |