netdev - Re: [PATCH net] ip: zero sockaddr returned on error queue

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Date:	Thu, 15 Jan 2015 11:06:01 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Willem de Bruijn <willemb@...gle.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH net] ip: zero sockaddr returned on error queue

On Thu, 2015-01-15 at 13:18 -0500, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> The sockaddr is returned in IP(V6)_RECVERR as part of errhdr. That
> structure is defined and allocated on the stack as
> 
>     struct {
>             struct sock_extended_err ee;
>             struct sockaddr_in(6)    offender;
>     } errhdr;
> 
> The second part is only initialized for certain SO_EE_ORIGIN values.
> Always initialize it completely.
> 
> An MTU exceeded error on a SOCK_RAW/IPPROTO_RAW is one example that
> would return uninitialized bytes.
> 
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>
> 
> ----

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


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