On Wed, May 15, 2024 at 11:31:25AM -0500, Daniel Jurgens wrote:
> The rtnl_lock would stay locked if allocating promisc_allmulti failed.
> Also changed the allocation to GFP_KERNEL.
>
> Fixes: ff7c7d9f5261 ("virtio_net: Remove command data from control_buf")
> Reported-by: Eric Dumazet <edumaset@xxxxxxxxxx>
> Link: https://lore.kernel.org/netdev/CANn89iLazVaUCvhPm6RPJJ0owra_oFnx7Fhc8d60gV-65ad3WQ@xxxxxxxxxxxxxx/
> Signed-off-by: Daniel Jurgens <danielj@xxxxxxxxxx>
Acked-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
> ---
> v3:
> - Changed to promisc_allmulti alloc to GPF_KERNEL
> v2:
> - Added fixes tag.
> ---
> drivers/net/virtio_net.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> index 19a9b50646c7..4e1a0fc0d555 100644
> --- a/drivers/net/virtio_net.c
> +++ b/drivers/net/virtio_net.c
> @@ -2902,14 +2902,14 @@ static void virtnet_rx_mode_work(struct work_struct *work)
> if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_RX))
> return;
>
> - rtnl_lock();
> -
> - promisc_allmulti = kzalloc(sizeof(*promisc_allmulti), GFP_ATOMIC);
> + promisc_allmulti = kzalloc(sizeof(*promisc_allmulti), GFP_KERNEL);
> if (!promisc_allmulti) {
> dev_warn(&dev->dev, "Failed to set RX mode, no memory.\n");
> return;
> }
>
> + rtnl_lock();
> +
> *promisc_allmulti = !!(dev->flags & IFF_PROMISC);
> sg_init_one(sg, promisc_allmulti, sizeof(*promisc_allmulti));
>
> --
> 2.45.0
