5.4-stable review patch. If anyone has any objections, please let me know.
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From: Elena Salomatkina esalomatkina@ispras.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@ispras.ru Link: https://patch.msgid.link/20241013124529.1043-1-esalomatkina@ispras.ru Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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);