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virtio-net: check the existence of peer before accessing vDPA config

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We try to check whether a peer is VDPA in order to get config from
there - with no peer, this leads to a NULL
pointer dereference. Add a check before trying to access the peer
type. No peer means not VDPA.

Fixes: 108a64818e ("vhost-vdpa: introduce vhost-vdpa backend")
Cc: Cindy Lu <lulu@redhat.com>
Tested-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jason Wang 2020-07-25 08:13:17 +08:00
parent a48aaf882b
commit c546ecf27d
1 changed files with 19 additions and 11 deletions
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30
hw/net/virtio-net.c
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@ -125,6 +125,7 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg;
NetClientState *nc = qemu_get_queue(n->nic);
int ret = 0;
memset(&netcfg, 0 , sizeof(struct virtio_net_config));
@ -142,13 +143,16 @@ static void virtio_net_get_config(VirtIODevice *vdev, uint8_t *config)
VIRTIO_NET_RSS_SUPPORTED_HASHES);
memcpy(config, &netcfg, n->config_size);
NetClientState *nc = qemu_get_queue(n->nic);
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
/*
* Is this VDPA? No peer means not VDPA: there's no way to
* disconnect/reconnect a VDPA peer.
*/
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
ret = vhost_net_get_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
n->config_size);
if (ret != -1) {
memcpy(config, &netcfg, n->config_size);
}
n->config_size);
if (ret != -1) {
memcpy(config, &netcfg, n->config_size);
}
}
}
@ -156,6 +160,7 @@ static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
{
VirtIONet *n = VIRTIO_NET(vdev);
struct virtio_net_config netcfg = {};
NetClientState *nc = qemu_get_queue(n->nic);
memcpy(&netcfg, config, n->config_size);
@ -166,11 +171,14 @@ static void virtio_net_set_config(VirtIODevice *vdev, const uint8_t *config)
qemu_format_nic_info_str(qemu_get_queue(n->nic), n->mac);
}
NetClientState *nc = qemu_get_queue(n->nic);
if (nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
vhost_net_set_config(get_vhost_net(nc->peer), (uint8_t *)&netcfg,
0, n->config_size,
VHOST_SET_CONFIG_TYPE_MASTER);
/*
* Is this VDPA? No peer means not VDPA: there's no way to
* disconnect/reconnect a VDPA peer.
*/
if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) {
vhost_net_set_config(get_vhost_net(nc->peer),
(uint8_t *)&netcfg, 0, n->config_size,
VHOST_SET_CONFIG_TYPE_MASTER);
}
}