[PATCH net 3/3] macsec: validate ICV length on link creation

[Davide Caratti]

Test the cipher suite initialization in case ICV length has a value
different than its default. If this test fails, creation of a new macsec
link will also fail. This avoids situations where further security
associations can't be added due to failures of crypto_aead_setauthsize(),
caused by unsupported user-provided values of the ICV length.

Signed-off-by: Davide Caratti <dcara...@redhat.com>
---
 drivers/net/macsec.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 6d45ba6..5441517 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -3206,8 +3206,20 @@ static int macsec_validate_attr(struct nlattr *tb[], 
struct nlattr *data[])
        if (data[IFLA_MACSEC_CIPHER_SUITE])
                csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
 
-       if (data[IFLA_MACSEC_ICV_LEN])
+       if (data[IFLA_MACSEC_ICV_LEN]) {
                icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
+               if (icv_len != DEFAULT_ICV_LEN) {
+                       char dummy_key[DEFAULT_SAK_LEN] = { 0 };
+                       struct crypto_aead *dummy_tfm;
+
+                       dummy_tfm = macsec_alloc_tfm(dummy_key,
+                                                    DEFAULT_SAK_LEN,
+                                                    icv_len);
+                       if (IS_ERR(dummy_tfm))
+                               return PTR_ERR(dummy_tfm);
+                       crypto_free_aead(dummy_tfm);
+               }
+       }
 
        switch (csid) {
        case MACSEC_DEFAULT_CIPHER_ID:
-- 
2.5.5