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rtnetlink: reject non-IFLA_VF_PORT attributes inside IFLA_VF_PORTS 

Similarly as in commit 4f7d2cdfdd ("rtnetlink: verify IFLA_VF_INFO
attributes before passing them to driver"), we have a double nesting
of netlink attributes, i.e. IFLA_VF_PORTS only contains IFLA_VF_PORT
that is nested itself. While IFLA_VF_PORTS is a verified attribute
from ifla_policy[], we only check if the IFLA_VF_PORTS container has
IFLA_VF_PORT attributes and then pass the attribute's content itself
via nla_parse_nested(). It would be more correct to reject inner types
other than IFLA_VF_PORT instead of continuing parsing and also similarly
as in commit 4f7d2cdfdd, to check for a minimum of NLA_HDRLEN.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Roopa Prabhu <roopa@cumulusnetworks.com>
Cc: Scott Feldman <sfeldma@gmail.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2015-07-13 00:06:02 +02:00 committed by David S. Miller
parent 50c2e4dd67
commit 035d210f92
1 changed files with 7 additions and 4 deletions
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11
net/core/rtnetlink.c
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@ -1804,10 +1804,13 @@ static int do_setlink(const struct sk_buff *skb,
goto errout;
nla_for_each_nested(attr, tb[IFLA_VF_PORTS], rem) {
if (nla_type(attr) != IFLA_VF_PORT)
continue;
err = nla_parse_nested(port, IFLA_PORT_MAX,
attr, ifla_port_policy);
if (nla_type(attr) != IFLA_VF_PORT ||
nla_len(attr) < NLA_HDRLEN) {
err = -EINVAL;
goto errout;
}
err = nla_parse_nested(port, IFLA_PORT_MAX, attr,
ifla_port_policy);
if (err < 0)
goto errout;
if (!port[IFLA_PORT_VF]) {