netdev - Re: [PATCH v3] virtio_net: Fix missed rtnl

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Message-ID: <20240515174242-mutt-send-email-mst@kernel.org>
Date: Wed, 15 May 2024 17:42:50 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Daniel Jurgens <danielj@...dia.com>
Cc: netdev@...r.kernel.org, jasowang@...hat.com, xuanzhuo@...ux.alibaba.com,
	virtualization@...ts.linux.dev, davem@...emloft.net,
	edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
	jiri@...dia.com, Eric Dumazet <edumaset@...gle.com>
Subject: Re: [PATCH v3] virtio_net: Fix missed rtnl_unlock

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@...gle.com>
> Link: https://lore.kernel.org/netdev/CANn89iLazVaUCvhPm6RPJJ0owra_oFnx7Fhc8d60gV-65ad3WQ@mail.gmail.com/
> Signed-off-by: Daniel Jurgens <danielj@...dia.com>


Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
> 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