netdev - Re: [PATCH 1/1] drivers: net: mhi: fix error path in mhi_net

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Date:   Fri, 24 Sep 2021 15:19:09 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Daniele Palmas <dnlplm@...il.com>
Cc:     Loic Poulain <loic.poulain@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH 1/1] drivers: net: mhi: fix error path in mhi_net_newlink

On Fri, Sep 24, 2021 at 11:26:52AM +0200, Daniele Palmas wrote:
> Fix double free_netdev when mhi_prepare_for_transfer fails.
> 
> Fixes: 3ffec6a14f24 ("net: Add mhi-net driver")
> Signed-off-by: Daniele Palmas <dnlplm@...il.com>

I guess this patch should be backported to stable kernels. So please CC stable
list.

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
>  drivers/net/mhi_net.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
> index d127eb6e9257..aaa628f859fd 100644
> --- a/drivers/net/mhi_net.c
> +++ b/drivers/net/mhi_net.c
> @@ -321,7 +321,7 @@ static int mhi_net_newlink(struct mhi_device *mhi_dev, struct net_device *ndev)
>  	/* Start MHI channels */
>  	err = mhi_prepare_for_transfer(mhi_dev);
>  	if (err)
> -		goto out_err;
> +		return err;
>  
>  	/* Number of transfer descriptors determines size of the queue */
>  	mhi_netdev->rx_queue_sz = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE);
> @@ -331,10 +331,6 @@ static int mhi_net_newlink(struct mhi_device *mhi_dev, struct net_device *ndev)
>  		return err;
>  
>  	return 0;
> -
> -out_err:
> -	free_netdev(ndev);
> -	return err;
>  }
>  
>  static void mhi_net_dellink(struct mhi_device *mhi_dev, struct net_device *ndev)
> -- 
> 2.30.2
>