netdev - Re: [PATCH 0/5 net] bridge: Fix missing Netlink message validations

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Message-ID: <20141126231436.GF32174@casper.infradead.org>
Date:	Wed, 26 Nov 2014 23:14:36 +0000
From:	Thomas Graf <tgraf@...g.ch>
To:	John Fastabend <john.fastabend@...il.com>
Cc:	Jiri Pirko <jiri@...nulli.us>, davem@...emloft.net,
	stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [PATCH 0/5 net] bridge: Fix missing Netlink message validations

On 11/26/14 at 09:25am, John Fastabend wrote:
> >--- a/net/ipv4/devinet.c
> >+++ b/net/ipv4/devinet.c
> >@@ -1687,8 +1687,11 @@ static int inet_set_link_af(struct net_device *dev, const struct nlattr *nla)
> >                BUG();
> >
> >        if (tb[IFLA_INET_CONF]) {
> >-               nla_for_each_nested(a, tb[IFLA_INET_CONF], rem)
> >+               nla_for_each_nested(a, tb[IFLA_INET_CONF], rem) {
> >+                       if (nla_len(a) < sizeof(u32))
> >+                               return -EINVAL;
> >                        ipv4_devconf_set(in_dev, nla_type(a), nla_get_u32(a));
> >+               }

Looked into this and found a validation function
inet_validate_link_af(). It's split to keep the updates atomic.
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