Re: [Qemu-devel] [PATCH] virtio: destroy region cache during reset

[Paolo Bonzini]

On 07/03/2017 09:47, Jason Wang wrote:
> We don't destroy region cache during reset which can make the maps
> of previous driver leaked to a buggy or malicious driver that don't
> set vring address before starting to use the device.

I'm still not sure as to how this can happen.  Reset does clear
desc/used/avail, which should then be checked before accessing the caches.

Paolo

> Fix this by
> destroy the region cache during reset and validate it before trying to
> use them. While at it, also validate address_space_cache_init() during
> virtio_init_region_cache() to make sure we have a correct region
> cache.