[PATCH v1] macvlan: add forgotten nla_policy for IFLA_MACVLAN_BC_CUTOFF

[Lin Ma]

The previous commit 954d1fa1ac93 ("macvlan: Add netlink attribute for
broadcast cutoff") added one additional attribute named
IFLA_MACVLAN_BC_CUTOFF to allow broadcast cutfoff.

However, it forgot to describe the nla_policy at macvlan_policy
(drivers/net/macvlan.c). Hence, this suppose NLA_S32 (4 bytes) integer
can be faked as empty (0 bytes) by a malicious user, which could leads
to OOB in heap just like CVE-2023-3773.

To fix it, this commit just completes the nla_policy description for
IFLA_MACVLAN_BC_CUTOFF. This enforces the length check and avoids the
potential OOB read.

Fixes: 954d1fa1ac93 ("macvlan: Add netlink attribute for broadcast cutoff")
Signed-off-by: Lin Ma <linma@xxxxxxxxxx>
---
 drivers/net/macvlan.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 4a53debf9d7c..ed908165a8b4 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -1746,6 +1746,7 @@ static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
 	[IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
 	[IFLA_MACVLAN_BC_QUEUE_LEN] = { .type = NLA_U32 },
 	[IFLA_MACVLAN_BC_QUEUE_LEN_USED] = { .type = NLA_REJECT },
+	[IFLA_MACVLAN_BC_CUTOFF] = { .type = NLA_S32 },
 };
 
 int macvlan_link_register(struct rtnl_link_ops *ops)
-- 
2.17.1