Re: [PATCH net v2] ipv4: don't set IPv6 only flags to IPv4 addresses

[David Miller]

From: Matteo Croce <mcroce@xxxxxxxxxx>
Date: Mon,  1 Jul 2019 19:01:55 +0200

> Avoid the situation where an IPV6 only flag is applied to an IPv4 address:
> 
>     # ip addr add 192.0.2.1/24 dev dummy0 nodad home mngtmpaddr noprefixroute
>     # ip -4 addr show dev dummy0
>     2: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
>         inet 192.0.2.1/24 scope global noprefixroute dummy0
>            valid_lft forever preferred_lft forever
> 
> Or worse, by sending a malicious netlink command:
> 
>     # ip -4 addr show dev dummy0
>     2: dummy0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default qlen 1000
>         inet 192.0.2.1/24 scope global nodad optimistic dadfailed home tentative mngtmpaddr noprefixroute stable-privacy dummy0
>            valid_lft forever preferred_lft forever
> 
> Signed-off-by: Matteo Croce <mcroce@xxxxxxxxxx>

Applied and queued up for -stable, thanks Matteo.