Linux Virtualization - Dec 2019 - [PATCH 4.14 121/161] crypto: virtio - deal with unsupported input sizes

From: Ard Biesheuvel <ardb at kernel.org>

[ Upstream commit 19c5da7d4a2662e85ea67d2d81df57e038fde3ab ]

Return -EINVAL for input sizes that are not a multiple of the AES
block size, since they are not supported by our CBC chaining mode.

While at it, remove the pr_err() that reports unsupported key sizes
being used: we shouldn't spam the kernel log with that.

Fixes: dbaf0624ffa5 ("crypto: add virtio-crypto driver")
Cc: "Michael S. Tsirkin" <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Cc: virtualization at lists.linux-foundation.org
Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/crypto/virtio/virtio_crypto_algs.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c
b/drivers/crypto/virtio/virtio_crypto_algs.c
index 5035b0dc1e40..e2231a1a05a1 100644
--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -110,8 +110,6 @@ virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
 		*alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
 		break;
 	default:
-		pr_err("virtio_crypto: Unsupported key length: %d\n",
-			key_len);
 		return -EINVAL;
 	}
 	return 0;
@@ -485,6 +483,11 @@ static int virtio_crypto_ablkcipher_encrypt(struct
ablkcipher_request *req)
 	/* Use the first data virtqueue as default */
 	struct data_queue *data_vq = &vcrypto->data_vq[0];
 
+	if (!req->nbytes)
+		return 0;
+	if (req->nbytes % AES_BLOCK_SIZE)
+		return -EINVAL;
+
 	vc_req->dataq = data_vq;
 	vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
 	vc_sym_req->ablkcipher_ctx = ctx;
@@ -505,6 +508,11 @@ static int virtio_crypto_ablkcipher_decrypt(struct
ablkcipher_request *req)
 	/* Use the first data virtqueue as default */
 	struct data_queue *data_vq = &vcrypto->data_vq[0];
 
+	if (!req->nbytes)
+		return 0;
+	if (req->nbytes % AES_BLOCK_SIZE)
+		return -EINVAL;
+
 	vc_req->dataq = data_vq;
 	vc_req->alg_cb = virtio_crypto_dataq_sym_callback;
 	vc_sym_req->ablkcipher_ctx = ctx;
-- 
2.20.1