net_sched: sch_skbprio: add message validation to skbprio_change()
Do not assume the attribute has the right size.
Fixes: aea5f654e6b7 ("net/sched: add skbprio scheduler")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_skbprio.c b/net/sched/sch_skbprio.c
index 0fb10ab..7a5e4c4 100644
--- a/net/sched/sch_skbprio.c
+++ b/net/sched/sch_skbprio.c
@@ -169,6 +169,9 @@ static int skbprio_change(struct Qdisc *sch, struct nlattr *opt,
{
struct tc_skbprio_qopt *ctl = nla_data(opt);
+ if (opt->nla_len != nla_attr_size(sizeof(*ctl)))
+ return -EINVAL;
+
sch->limit = ctl->limit;
return 0;
}