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virtio: validate address space cache during init 

We don't check the return value of address_space_cache_init(), this
may lead buggy driver use incorrect region caches. Instead of
triggering an assert, catch and warn this early in
virtio_init_region_cache().

Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang 2017-03-15 19:48:32 +08:00 committed by Michael S. Tsirkin
parent e0e2d64409
commit e45da65322
1 changed files with 27 additions and 6 deletions
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33
hw/virtio/virtio.c
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@ -131,6 +131,7 @@ static void virtio_init_region_cache(VirtIODevice *vdev, int n)
VRingMemoryRegionCaches *new;
hwaddr addr, size;
int event_size;
int64_t len;
event_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
@ -140,21 +141,41 @@ static void virtio_init_region_cache(VirtIODevice *vdev, int n)
}
new = g_new0(VRingMemoryRegionCaches, 1);
size = virtio_queue_get_desc_size(vdev, n);
address_space_cache_init(&new->desc, vdev->dma_as,
addr, size, false);
len = address_space_cache_init(&new->desc, vdev->dma_as,
addr, size, false);
if (len < size) {
virtio_error(vdev, "Cannot map desc");
goto err_desc;
}
size = virtio_queue_get_used_size(vdev, n) + event_size;
address_space_cache_init(&new->used, vdev->dma_as,
vq->vring.used, size, true);
len = address_space_cache_init(&new->used, vdev->dma_as,
vq->vring.used, size, true);
if (len < size) {
virtio_error(vdev, "Cannot map used");
goto err_used;
}
size = virtio_queue_get_avail_size(vdev, n) + event_size;
address_space_cache_init(&new->avail, vdev->dma_as,
vq->vring.avail, size, false);
len = address_space_cache_init(&new->avail, vdev->dma_as,
vq->vring.avail, size, false);
if (len < size) {
virtio_error(vdev, "Cannot map avail");
goto err_avail;
}
atomic_rcu_set(&vq->vring.caches, new);
if (old) {
call_rcu(old, virtio_free_region_cache, rcu);
}
return;
err_avail:
address_space_cache_destroy(&new->used);
err_used:
address_space_cache_destroy(&new->desc);
err_desc:
g_free(new);
}
/* virt queue functions */