[U-Boot] [U-Boot, v2, 1/1] net: dns: fix for DNS queries sent to the wrong MAC address

[Tom Rini]

On Fri, Sep 12, 2014 at 08:48:15AM +0200, Gerhard Sittig wrote:

> When a DNS query is sent out, the ethernet packet can get directed to
> the MAC address of a server that was communicated to before.  This is
> wrong when the previously stored MAC address corresponds to a different
> server's IP address, i.e. when the IP address of the previous and the
> current communication are different.
> 
> The error can get reproduced by running a sequence of e.g. a TFTP
> download and a DNS query, where the TFTP and DNS servers reside on
> individual machines.
> 
> The fix is to clear the server's MAC address that might be left from a
> previous operation, and to fetch the peer's MAC address in a new ARP
> lookup, before the DNS query is sent.  This is the approach taken in
> other network services, like 8e52533d1095 ("net: tftpsrv: Get correct
> client MAC address").
> 
> Reported-by: Dirk Zimoch <dirk.zimoch at psi.ch>
> Signed-off-by: Gerhard Sittig <gsi at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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