Re: v2 [PATCH net-next 4/7] ipv6: Check return of dev_set_allmulti

[Patrick McHardy <kaber@trash.net>]

Wang Chen wrote:
> allmulti might overflow.
> Commit: "netdevice: Fix promiscuity and allmulti overflow" in net-next makes
> dev_set_promiscuity/allmulti return error number if overflow happened.
> 
> Here, we check the positive increment for allmulti to get error return.
> 
> Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
> ---
>  net/ipv6/ip6mr.c |    5 ++++-
>  1 files changed, 4 insertions(+), 1 deletions(-)
> 
> diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
> index 1479618..3e2d964 100644
> --- a/net/ipv6/ip6mr.c
> +++ b/net/ipv6/ip6mr.c
> @@ -603,6 +603,7 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
>  	int vifi = vifc->mif6c_mifi;
>  	struct mif_device *v = &vif6_table[vifi];
>  	struct net_device *dev;
> +	int err;
>  
>  	/* Is vif busy ? */
>  	if (MIF_EXISTS(vifi))
> @@ -632,7 +633,9 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
>  		return -EINVAL;
>  	}
>  
> -	dev_set_allmulti(dev, 1);
> +	err = dev_set_allmulti(dev, 1);
> +	if (err)
> +		return err;


Missing error handling for the MIFF_REGISTER case.