crypto: virtio - deal with unsupported input sizes

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: 659c9ea6816d ("crypto: add virtio-crypto driver")
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Gonglei <arei.gonglei@huawei.com>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c
index 65ec108001371d129bb51894a7df96721276c4f6..82b316b2f53760382b9c4bc81f4bbf48addc4c57 100644 (file)
--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -105,8 +105,6 @@ 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;
@@ -489,6 +487,11 @@ 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;
@@ -509,6 +512,11 @@ 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;