From: Thomas Graf <tgraf@infradead.org>
Date: Thu, 11 Nov 2010 15:47:59 +0000 (+0000)
Subject: rtnetlink: Fix message size calculation for link messages
X-Git-Tag: v2.6.37-rc2~20^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=369cf77a6a3e41b1110506ddf43d45804103bfde;p=pandora-kernel.git

rtnetlink: Fix message size calculation for link messages

nlmsg_total_size() calculates the length of a netlink message
including header and alignment. nla_total_size() calculates the
space an individual attribute consumes which was meant to be used
in this context.

Also, ensure to account for the attribute header for the
IFLA_INFO_XSTATS attribute as implementations of get_xstats_size()
seem to assume that we do so.

The addition of two message headers minus the missing attribute
header resulted in a calculated message size that was larger than
required. Therefore we never risked running out of skb tailroom.

Signed-off-by: Thomas Graf <tgraf@infradead.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

Reading git-diff-tree failed