netdev - Re: [PATCH net] netlink: Fix nlmsg_parse as a wrapper for strict message parsing

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Date:   Tue, 13 Aug 2019 13:31:34 +0200
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     David Ahern <dsahern@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, johannes.berg@...el.com,
        edumazet@...gle.com, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH net] netlink: Fix nlmsg_parse as a wrapper for strict
 message parsing



On 8/12/19 10:07 PM, David Ahern wrote:
> From: David Ahern <dsahern@...il.com>
> 
> Eric reported a syzbot warning:
> 
> 
> The root cause is nlmsg_parse calling __nla_parse which means the
> header struct size is not checked.
> 
> nlmsg_parse should be a wrapper around __nlmsg_parse with
> NL_VALIDATE_STRICT for the validate argument very much like
> nlmsg_parse_deprecated is for NL_VALIDATE_LIBERAL.
> 
> Fixes: 3de6440354465 ("netlink: re-add parse/validate functions in strict mode")
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Signed-off-by: David Ahern <dsahern@...il.com>
> ---

Reviewed-by: Eric Dumazet <edumazet@...gle.com>

Thanks !