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Subject: Re: [PATCH 4.4 24/24] net: metrics: add proper netlink validation
From: Ben Hutchings <ben.hutchings@codethink.co.uk>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org, Eric Dumazet <edumazet@google.com>,
        syzbot <syzkaller@googlegroups.com>,
        David Ahern <dsahern@gmail.com>,
        "David S. Miller" <davem@davemloft.net>
Date: Tue, 19 Jun 2018 14:15:30 +0100
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         <20180612164817.877152473@linuxfoundation.org>
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On Tue, 2018-06-12 at 18:52 +0200, Greg Kroah-Hartman wrote:
> 4.4-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Eric Dumazet <edumazet@google.com>
> 
> [ Upstream commit 5b5e7a0de2bbf2a1afcd9f49e940010e9fb80d53 ]
[...]
> --- a/net/ipv4/fib_semantics.c
> +++ b/net/ipv4/fib_semantics.c
> @@ -979,6 +979,8 @@ fib_convert_metrics(struct fib_info *fi,
>  			if (val == TCP_CA_UNSPEC)
>  				return -EINVAL;
>  		} else {
> +			if (nla_len(nla) != sizeof(u32))
> +				return false;

For 4.4 and 4.9, the return value on error needs to be -EINVAL.

Ben.

>  			val = nla_get_u32(nla);
>  		}
>  		if (type == RTAX_ADVMSS && val > 65535 - 40)

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom