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| author | Ani Sinha <anisinha@redhat.com> | 2023-06-28 16:58:04 +0530 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2023-06-28 07:53:14 -0400 |
| commit | ca3fcdeeeef56f46a7ac7b2408eda608d59be6f1 (patch) | |
| tree | 5776d8d338476512a863eae46c6ff079b7872975 /hw | |
| parent | a0d7215e339b61c7d7a7b3fcf754954d80d93eb8 (diff) | |
| download | qemu-ca3fcdeeeef56f46a7ac7b2408eda608d59be6f1.zip qemu-ca3fcdeeeef56f46a7ac7b2408eda608d59be6f1.tar.gz qemu-ca3fcdeeeef56f46a7ac7b2408eda608d59be6f1.tar.bz2 | |
net/vhost-net: do not assert on null pointer return from tap_get_vhost_net()
When 'vhost=off' or no vhost specific options at all are passed for the tap
net-device backend, tap_get_vhost_net() can return NULL. The function
net_init_tap_one() does not call vhost_net_init() on such cases and therefore
vhost_net pointer within the tap device state structure remains NULL. Hence,
assertion here on a NULL pointer return from tap_get_vhost_net() would not be
correct. Remove it and fix the crash generated by qemu upon initialization in
the following call chain :
qdev_realize() -> pci_qdev_realize() -> virtio_device_realize() ->
virtio_bus_device_plugged() -> virtio_net_get_features() -> get_vhost_net()
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: Cédric Le Goater <clg@redhat.com>
Fixes: 0e994668d00c9c ("vhost_net: add an assertion for TAP client backends")
Reported-by: Cédric Le Goater <clg@redhat.com>
Report: <abab7a71-216d-b103-fa47-70bdf9dc0080@redhat.com>
Signed-off-by: Ani Sinha <anisinha@redhat.com>
Message-Id: <20230628112804.36676-1-anisinha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/net/vhost_net.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c index 6db23ca..6b958d6 100644 --- a/hw/net/vhost_net.c +++ b/hw/net/vhost_net.c @@ -507,7 +507,12 @@ VHostNetState *get_vhost_net(NetClientState *nc) switch (nc->info->type) { case NET_CLIENT_DRIVER_TAP: vhost_net = tap_get_vhost_net(nc); - assert(vhost_net); + /* + * tap_get_vhost_net() can return NULL if a tap net-device backend is + * created with 'vhost=off' option, 'vhostforce=off' or no vhost or + * vhostforce or vhostfd options at all. Please see net_init_tap_one(). + * Hence, we omit the assertion here. + */ break; #ifdef CONFIG_VHOST_NET_USER case NET_CLIENT_DRIVER_VHOST_USER: |