6.11-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jason Wang <jasowang@xxxxxxxxxx>
[ Upstream commit c392d6019398315526b0b508282f87c7b2318c72 ]
We calculate guest offloads during probe without the protection of
rtnl_lock. This lead to race between probe and ndo_set_features. Fix
this by moving the calculation under the rtnl_lock.
Fixes: 3f93522ffab2 ("virtio-net: switch off offloads on demand if possible on XDP set")
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
Link: https://patch.msgid.link/20240814052228.4654-5-jasowang@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/virtio_net.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 60833e7b5a935..6f4781ec2b369 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -6603,6 +6603,11 @@ static int virtnet_probe(struct virtio_device *vdev)
netif_carrier_on(dev);
}
+ for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
+ if (virtio_has_feature(vi->vdev, guest_offloads[i]))
+ set_bit(guest_offloads[i], &vi->guest_offloads);
+ vi->guest_offloads_capable = vi->guest_offloads;
+
rtnl_unlock();
err = virtnet_cpu_notif_add(vi);
@@ -6611,11 +6616,6 @@ static int virtnet_probe(struct virtio_device *vdev)
goto free_unregister_netdev;
}
- for (i = 0; i < ARRAY_SIZE(guest_offloads); i++)
- if (virtio_has_feature(vi->vdev, guest_offloads[i]))
- set_bit(guest_offloads[i], &vi->guest_offloads);
- vi->guest_offloads_capable = vi->guest_offloads;
-
pr_debug("virtnet: registered device %s with %d RX and TX vq's\n",
dev->name, max_queue_pairs);
--
2.43.0
