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.

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>

diff --git a/net/sched/sch_cbs.c b/net/sched/sch_cbs.c
index 939425da18955bc8a3f3d2d5b852b2585e9bcaee..8c9a0400c8622c652db290796f2dd338eb61799c 100644 (file)
--- a/net/sched/sch_cbs.c
+++ b/net/sched/sch_cbs.c
@@ -310,7 +310,7 @@ 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);