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net_sched: sch_skbprio: add message validation to skbprio_change()

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[ Upstream commit 2761121af87de45951989a0adada917837d8fa82 ]

Do not assume the attribute has the right size.

Fixes: aea5f654e6 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2020-05-02 20:09:25 -07:00 committed by Greg Kroah-Hartman
parent c78c166748
commit b51b394f4a
1 changed files with 3 additions and 0 deletions
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3
net/sched/sch_skbprio.c
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@ -169,6 +169,9 @@ static int skbprio_change(struct Qdisc *sch, struct nlattr *opt,
{ {
struct tc_skbprio_qopt *ctl = nla_data(opt); struct tc_skbprio_qopt *ctl = nla_data(opt);
if (opt->nla_len != nla_attr_size(sizeof(*ctl)))
return -EINVAL;
sch->limit = ctl->limit; sch->limit = ctl->limit;
return 0; return 0;
} }