sch_prio: Fix nla_parse_nested_compat() regression

[ No upstream commit, this is fixing code no longer in 2.6.27 ]

nla_parse_nested_compat() was used to parse two different message
formats in the netem and prio qdisc, when it was "fixed" to work
with netem, it broke the multi queue support in the prio qdisc.
Since the prio qdisc code in question is already removed in the
development tree, this patch only fixes the regression in the
stable tree.

Based on original patch from Alexander H Duyck <alexander.h.duyck@intel.com>

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 4aa2b45dad0a80232ed1d1d1c2fbabf33b19ec8f..d11f8d6a6afb429aff82d302bfa920f22eb6e8bc 100644 (file)
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -228,14 +228,20 @@ static int prio_tune(struct Qdisc *sch, struct nlattr *opt)
 {
        struct prio_sched_data *q = qdisc_priv(sch);
        struct tc_prio_qopt *qopt;
-       struct nlattr *tb[TCA_PRIO_MAX + 1];
+       struct nlattr *tb[TCA_PRIO_MAX + 1] = {0};
        int err;
        int i;
 
-       err = nla_parse_nested_compat(tb, TCA_PRIO_MAX, opt, NULL, qopt,
-                                     sizeof(*qopt));
-       if (err < 0)
-               return err;
+       qopt = nla_data(opt);
+       if (nla_len(opt) < sizeof(*qopt))
+               return -1;
+
+       if (nla_len(opt) >= sizeof(*qopt) + sizeof(struct nlattr)) {
+               err = nla_parse_nested(tb, TCA_PRIO_MAX,
+                                      (struct nlattr *) (qopt + 1), NULL);
+               if (err < 0)
+                       return err;
+       }
 
        q->bands = qopt->bands;
        /* If we're multiqueue, make sure the number of incoming bands