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virito-pci: fix OVERRUN problem 

Overrunning array "proxy->guest_features" of 2 4-byte
elements at element index 2 (byte offset 8) using index
"proxy->gfselect" (which evaluates to 2). Normally, the
Linux kernel driver just read/write '0' or '1' as the
"proxy->gfselect" values, so using '<' instead of '=<' to
make coverity happy and avoid potential harm.

Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gonglei 2015-06-23 09:53:04 +08:00 committed by Michael S. Tsirkin
parent 0c8ff723bd
commit 3750dabc69
1 changed files with 2 additions and 2 deletions
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4
hw/virtio/virtio-pci.c
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@ -977,7 +977,7 @@ static uint64_t virtio_pci_common_read(void *opaque, hwaddr addr,
val = proxy->gfselect;
break;
case VIRTIO_PCI_COMMON_GF:
if (proxy->gfselect <= ARRAY_SIZE(proxy->guest_features)) {
if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
val = proxy->guest_features[proxy->gfselect];
}
break;
@ -1052,7 +1052,7 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr,
proxy->gfselect = val;
break;
case VIRTIO_PCI_COMMON_GF:
if (proxy->gfselect <= ARRAY_SIZE(proxy->guest_features)) {
if (proxy->gfselect < ARRAY_SIZE(proxy->guest_features)) {
proxy->guest_features[proxy->gfselect] = val;
virtio_set_features(vdev,
(((uint64_t)proxy->guest_features[1]) << 32) |