From: Dan Carpenter <dan.carpenter@oracle.com>
To: Andrew Lunn <andrew@lunn.ch>, Florian Fainelli <f.fainelli@gmail.com>
Cc: Vivien Didelot <vivien.didelot@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH net] net: dsa: bcm_sf2: potential array overflow in bcm_sf2_sw_suspend()
Date: Wed, 13 Feb 2019 11:23:04 +0300 [thread overview]
Message-ID: <20190213082304.GA14113@kadam> (raw)
The value of ->num_ports comes from bcm_sf2_sw_probe() and it is less
than or equal to DSA_MAX_PORTS. The ds->ports[] array is used inside
the dsa_is_user_port() and dsa_is_cpu_port() functions. The ds->ports[]
array is allocated in dsa_switch_alloc() and it has ds->num_ports
elements so this leads to a static checker warning about a potential out
of bounds read.
Fixes: 8cfa94984c9c ("net: dsa: bcm_sf2: add suspend/resume callbacks")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
drivers/net/dsa/bcm_sf2.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/dsa/bcm_sf2.c b/drivers/net/dsa/bcm_sf2.c
index 5193da67dcdc..98696a88fa1c 100644
--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -690,7 +690,7 @@ static int bcm_sf2_sw_suspend(struct dsa_switch *ds)
* port, the other ones have already been disabled during
* bcm_sf2_sw_setup
*/
- for (port = 0; port < DSA_MAX_PORTS; port++) {
+ for (port = 0; port < ds->num_ports; port++) {
if (dsa_is_user_port(ds, port) || dsa_is_cpu_port(ds, port))
bcm_sf2_port_disable(ds, port, NULL);
}
--
2.17.1
next reply other threads:[~2019-02-13 8:23 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 8:23 Dan Carpenter [this message]
2019-02-13 13:13 ` [PATCH net] net: dsa: bcm_sf2: potential array overflow in bcm_sf2_sw_suspend() Vivien Didelot
2019-02-14 6:13 ` David Miller
2019-02-15 0:31 ` Florian Fainelli
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