The dcb netlink code was not validating that the IEEE_APP netlink element was correctly formed. Initially discovered because of the warning ‘dcbnl_ieee_app’ defined but not used. This indicated that the message was not being fully validated.
Compile tested only. Do not have DCB setup. Signed-off-by: Stephen Hemminger <[email protected]> --- net/dcb/dcbnl.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c index 3202d75329b5..52f0f2fc0a51 100644 --- a/net/dcb/dcbnl.c +++ b/net/dcb/dcbnl.c @@ -178,10 +178,6 @@ static const struct nla_policy dcbnl_ieee_policy[DCB_ATTR_IEEE_MAX + 1] = { [DCB_ATTR_IEEE_QCN_STATS] = {.len = sizeof(struct ieee_qcn_stats)}, }; -static const struct nla_policy dcbnl_ieee_app[DCB_ATTR_IEEE_APP_MAX + 1] = { - [DCB_ATTR_IEEE_APP] = {.len = sizeof(struct dcb_app)}, -}; - /* DCB number of traffic classes nested attributes. */ static const struct nla_policy dcbnl_featcfg_nest[DCB_FEATCFG_ATTR_MAX + 1] = { [DCB_FEATCFG_ATTR_ALL] = {.type = NLA_FLAG}, @@ -1466,8 +1462,15 @@ static int dcbnl_ieee_set(struct net_device *netdev, struct nlmsghdr *nlh, nla_for_each_nested(attr, ieee[DCB_ATTR_IEEE_APP_TABLE], rem) { struct dcb_app *app_data; + if (nla_type(attr) != DCB_ATTR_IEEE_APP) continue; + + if (nla_len(attr) != sizeof(struct dcb_app)) { + err = -ERANGE; + goto err; + } + app_data = nla_data(attr); if (ops->ieee_setapp) err = ops->ieee_setapp(netdev, app_data); -- 2.11.0
