netdev - [PATCH net-next] net: sched: sch: Fix off by one in htb_activate

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Date:   Mon, 6 Feb 2023 16:18:32 +0300
From:   Dan Carpenter <error27@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Kees Cook <keescook@...omium.org>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Simon Horman <simon.horman@...igine.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH net-next] net: sched: sch: Fix off by one in
 htb_activate_prios()

The > needs be >= to prevent an out of bounds access.

Fixes: de5ca4c3852f ("net: sched: sch: Bounds check priority")
Signed-off-by: Dan Carpenter <error27@...il.com>
---
 net/sched/sch_htb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index cc28e41fb745..92f2975b6a82 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -433,7 +433,7 @@ static void htb_activate_prios(struct htb_sched *q, struct htb_class *cl)
 		while (m) {
 			unsigned int prio = ffz(~m);
 
-			if (WARN_ON_ONCE(prio > ARRAY_SIZE(p->inner.clprio)))
+			if (WARN_ON_ONCE(prio >= ARRAY_SIZE(p->inner.clprio)))
 				break;
 			m &= ~(1 << prio);
 
-- 
2.35.1