net: macsec: fix the length used to copy the key for offloading

The key length used when offloading macsec to Ethernet or PHY drivers
was set to MACSEC_KEYID_LEN (16), which is an issue as:
- This was never meant to be the key length.
- The key length can be > 16.

Fix this by using MACSEC_MAX_KEY_LEN to store the key (the max length
accepted in uAPI) and secy->key_len to copy it.

Fixes: 3cf3227a21d1 ("net: macsec: hardware offloading infrastructure")
Reported-by: Lior Nahmanson <liorna@nvidia.com>
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 92425e1..93dc48b 100644 (file)
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -1819,7 +1819,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
                ctx.sa.rx_sa = rx_sa;
                ctx.secy = secy;
                memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
-                      MACSEC_KEYID_LEN);
+                      secy->key_len);
 
                err = macsec_offload(ops->mdo_add_rxsa, &ctx);
                if (err)
@@ -2061,7 +2061,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
                ctx.sa.tx_sa = tx_sa;
                ctx.secy = secy;
                memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
-                      MACSEC_KEYID_LEN);
+                      secy->key_len);
 
                err = macsec_offload(ops->mdo_add_txsa, &ctx);
                if (err)

diff --git a/include/net/macsec.h b/include/net/macsec.h
index 52874cd..d6fa6b9 100644 (file)
--- a/include/net/macsec.h
+++ b/include/net/macsec.h
@@ -241,7 +241,7 @@ struct macsec_context {
        struct macsec_rx_sc *rx_sc;
        struct {
                unsigned char assoc_num;
-               u8 key[MACSEC_KEYID_LEN];
+               u8 key[MACSEC_MAX_KEY_LEN];
                union {
                        struct macsec_rx_sa *rx_sa;
                        struct macsec_tx_sa *tx_sa;