[PATCH v4 02/10] crypto: aspeed - clear the crypto_aes_ctx when done

[PATCH v4 02/10] crypto: aspeed - clear the crypto_aes_ctx when done

[Thomas Huth]

From: Thomas Huth <thuth@redhat.com>

Declare the gen_aes_key with __cleanup(aes_zeroize_ctx) to avoid that
its contents could be leaking via the stack when the function returns.
And since it is only required in one branch of the if-statement there,
move it to that block, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 drivers/crypto/aspeed/aspeed-hace-crypto.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/crypto/aspeed/aspeed-hace-crypto.c b/drivers/crypto/aspeed/aspeed-hace-crypto.c
index fa201dae1f81b..e7d3f611df05c 100644
--- a/drivers/crypto/aspeed/aspeed-hace-crypto.c
+++ b/drivers/crypto/aspeed/aspeed-hace-crypto.c
@@ -576,7 +576,6 @@ static int aspeed_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
 {
 	struct aspeed_cipher_ctx *ctx = crypto_skcipher_ctx(cipher);
 	struct aspeed_hace_dev *hace_dev = ctx->hace_dev;
-	struct crypto_aes_ctx gen_aes_key;
 
 	CIPHER_DBG(hace_dev, "keylen: %d bits\n", (keylen * 8));
 
@@ -585,9 +584,9 @@ static int aspeed_aes_setkey(struct crypto_skcipher *cipher, const u8 *key,
 		return -EINVAL;
 
 	if (ctx->hace_dev->version == AST2500_VERSION) {
+		struct crypto_aes_ctx gen_aes_key __cleanup(aes_zeroize_ctx);
 		aes_expandkey(&gen_aes_key, key, keylen);
 		memcpy(ctx->key, gen_aes_key.key_enc, AES_MAX_KEYLENGTH);
-
 	} else {
 		memcpy(ctx->key, key, keylen);
 	}
-- 
2.55.0