netdev - Re: [PATCH v2 net] vxlan: fix incorrect initializer in union vxlan

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Date:	Fri, 22 Aug 2014 19:55:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gstenzel@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH v2 net] vxlan: fix incorrect initializer in union
 vxlan_addr

From: Gerhard Stenzel <gstenzel@...ux.vnet.ibm.com>
Date: Fri, 22 Aug 2014 21:34:16 +0200

> The first initializer in the following
> 
>         union vxlan_addr ipa = {
>             .sin.sin_addr.s_addr = tip,
>             .sa.sa_family = AF_INET,
>         };
> 
> is optimised away by the compiler, due to the second initializer,
> therefore initialising .sin.sin_addr.s_addr always to 0.
> This results in netlink messages indicating a L3 miss never contain the
> missed IP address. This was observed with GCC 4.8 and 4.9. I do not know about previous versions.
> The problem affects user space programs relying on an IP address being
> sent as part of a netlink message indicating a L3 miss.
> 
> Changing
>             .sa.sa_family = AF_INET,
> to
>             .sin.sin_family = AF_INET,
> fixes the problem.
> 
> Signed-off-by: Gerhard Stenzel <gerhard.stenzel@...ibm.com>

Applied and queued up for -stable, thanks.
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