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rtnetlink: fix link attribute validation with IFLA_GROUP 

rtnl_group_changelink() is invoked by rtnl_newlink() before the link
attributes have been validated. Additionally the group changes are
performed even if NLM_F_CREATE is specified and a new link is
created, while more reasonable semantics would be to set the group
value on the newly created link.

Fix both problems by moving the rtnl_group_changelink() invocation
down to the handling of non-existant links without NLM_F_CREATE()
and add a dev_set_group() call to rtnl_create_link().

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Vlad Dogaru <ddvlad@rosedu.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2011-01-20 03:00:42 +00:00 committed by David S. Miller
parent d52344a7ae
commit ffa934f192
1 changed files with 8 additions and 5 deletions
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13
net/core/rtnetlink.c
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@ -1548,6 +1548,8 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
set_operstate(dev, nla_get_u8(tb[IFLA_OPERSTATE]));
if (tb[IFLA_LINKMODE])
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
if (tb[IFLA_GROUP])
dev_set_group(dev, nla_get_u32(tb[IFLA_GROUP]));
return dev;
@ -1606,10 +1608,6 @@ replay:
else {
if (ifname[0])
dev = __dev_get_by_name(net, ifname);
else if (tb[IFLA_GROUP])
return rtnl_group_changelink(net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, tb);
else
dev = NULL;
}
@ -1676,8 +1674,13 @@ replay:
return do_setlink(dev, ifm, tb, ifname, modified);
}
if (!(nlh->nlmsg_flags & NLM_F_CREATE))
if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
if (ifm->ifi_index == 0 && tb[IFLA_GROUP])
return rtnl_group_changelink(net,
nla_get_u32(tb[IFLA_GROUP]),
ifm, tb);
return -ENODEV;
}
if (ifm->ifi_index)
return -EOPNOTSUPP;