netdev - [PATCH net] net/sched: cbs: Fix integer overflow in cbs_set_port

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Message-Id: <20241013124529.1043-1-esalomatkina@ispras.ru>
Date: Sun, 13 Oct 2024 15:45:29 +0300
From: Elena Salomatkina <esalomatkina@...ras.ru>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: Elena Salomatkina <esalomatkina@...ras.ru>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Jiri Pirko <jiri@...nulli.us>,
	"David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Leandro Dorileo <leandro.maciel.dorileo@...el.com>,
	Vedang Patel <vedang.patel@...el.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH net] net/sched: cbs: Fix integer overflow in cbs_set_port_rate()

The subsequent calculation of port_rate = speed * 1000 * BYTES_PER_KBIT,
where the BYTES_PER_KBIT is of type LL, may cause an overflow.
At least when speed = SPEED_20000, the expression to the left of port_rate
will be greater than INT_MAX.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: e0a7683d30e9 ("net/sched: cbs: fix port_rate miscalculation")
Signed-off-by: Elena Salomatkina <esalomatkina@...ras.ru>
---
 net/sched/sch_cbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index 2eaac2ff380f..db92ae819fd2 100644
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -309,7 +309,7 @@ static void cbs_set_port_rate(struct net_device *dev, struct cbs_sched_data *q)
 {
 	struct ethtool_link_ksettings ecmd;
 	int speed = SPEED_10;
-	int port_rate;
+	s64 port_rate;
 	int err;
 
 	err = __ethtool_get_link_ksettings(dev, &ecmd);
-- 
2.33.0