netdev - [PATCH AUTOSEL 5.4 07/28] net/sched: cbs: Fix integer overflow in cbs_set_port

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Message-ID: <20241124135549.3350700-7-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:55:07 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Elena Salomatkina <esalomatkina@...ras.ru>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	vinicius.gomes@...el.com,
	jhs@...atatu.com,
	xiyou.wangcong@...il.com,
	jiri@...nulli.us,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 07/28] net/sched: cbs: Fix integer overflow in cbs_set_port_rate()

From: Elena Salomatkina <esalomatkina@...ras.ru>

[ Upstream commit 397006ba5d918f9b74e734867e8fddbc36dc2282 ]

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.

Signed-off-by: Elena Salomatkina <esalomatkina@...ras.ru>
Link: https://patch.msgid.link/20241013124529.1043-1-esalomatkina@ispras.ru
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 2eaac2ff380fa..db92ae819fd28 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);
-- 
2.43.0