net: dsa: b53: fix an off by one in checking "vlan->vid"

commit 8e4052c32d6b4b39c1e13c652c7e33748d447409 upstream. The > comparison should be >= to prevent accessing one element beyond the end of the dev->vlans[] array in the caller function, b53_vlan_add(). The "dev->vlans" array is allocated in the b53_switch_init() function and it has "dev->num_vlans" elements. Fixes: a2482d2 ("net: dsa: b53: Plug in VLAN support") Signed-off-by: Dan Carpenter <[email protected]> Acked-by: Florian Fainelli <[email protected]> Link: https://lore.kernel.org/r/YAbxI97Dl/pmBy5V@mwanda Signed-off-by: Jakub Kicinski <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
ArchiveRepositories · Jan 30, 2021 · 24c1a3d · 24c1a3d
1 parent ed4b430
commit 24c1a3d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
@@ -946,7 +946,7 @@ static int b53_vlan_prepare(struct dsa_switch *ds, int port,
 	if ((is5325(dev) || is5365(dev)) && vlan->vid_begin == 0)
 		return -EOPNOTSUPP;
 
-	if (vlan->vid_end > dev->num_vlans)
+	if (vlan->vid_end >= dev->num_vlans)
 		return -ERANGE;
 
 	b53_enable_vlan(dev, true);