[v2,2/9] crypto: authencesn - don't leak pointers to authenc keys

Commit Message

Tudor Ambarus March 23, 2018, 10:42 a.m. UTC

In crypto_authenc_esn_setkey we save pointers to the authenc keys
in a local variable of type struct crypto_authenc_keys and we don't
zeroize it after use. Fix this and don't leak pointers to the
authenc keys.

Signed-off-by: Tudor Ambarus <[e-mail]>
---
 crypto/authencesn.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

Patch

diff --git a/crypto/authencesn.c b/crypto/authencesn.c
index 15f91dd..3bed6d1 100644
--- a/crypto/authencesn.c
+++ b/crypto/authencesn.c
@@ -69,8 +69,10 @@  static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *
 	struct crypto_authenc_keys keys;
 	int err = -EINVAL;
 
-	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
-		goto badkey;
+	if (crypto_authenc_extractkeys(&keys, key, keylen) != 0) {
+		crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
+		goto out;
+	}
 
 	crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
 	crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
@@ -90,11 +92,8 @@  static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *
 					   CRYPTO_TFM_RES_MASK);
 
 out:
+	memzero_explicit(&keys, sizeof(keys));
 	return err;
-
-badkey:
-	crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
-	goto out;
 }
 
 static int crypto_authenc_esn_genicv_tail(struct aead_request *req,