crypto: qat: fix issue when mapping assoc to internal AD struct

This patch fixes an issue when building an internal AD representation.
We need to check assoclen and not only blindly loop over assoc sgl.
Signed-off-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/qat_algs.c

@@ -653,7 +653,7 @@ static void qat_alg_free_bufl(struct qat_crypto_instance *inst,
 }
 
 static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
-			       struct scatterlist *assoc,
+			       struct scatterlist *assoc, int assoclen,
 			       struct scatterlist *sgl,
 			       struct scatterlist *sglout, uint8_t *iv,
 			       uint8_t ivlen,
@@ -685,15 +685,21 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst,
 	for_each_sg(assoc, sg, assoc_n, i) {
 		if (!sg->length)
 			continue;
-		bufl->bufers[bufs].addr = dma_map_single(dev,
-							 sg_virt(sg),
-							 sg->length,
+
+		if (!(assoclen > 0))
+			break;
+
+		bufl->bufers[bufs].addr =
+			dma_map_single(dev, sg_virt(sg),
+				       min_t(int, assoclen, sg->length),
 				       DMA_BIDIRECTIONAL);
-		bufl->bufers[bufs].len = sg->length;
+		bufl->bufers[bufs].len = min_t(int, assoclen, sg->length);
 		if (unlikely(dma_mapping_error(dev, bufl->bufers[bufs].addr)))
 			goto err;
 		bufs++;
+		assoclen -= sg->length;
 	}
+
 	if (ivlen) {
 		bufl->bufers[bufs].addr = dma_map_single(dev, iv, ivlen,
 							 DMA_BIDIRECTIONAL);
@@ -845,8 +851,9 @@ static int qat_alg_aead_dec(struct aead_request *areq)
 	int digst_size = crypto_aead_crt(aead_tfm)->authsize;
 	int ret, ctr = 0;
 
-	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->assoc, areq->src, areq->dst,
-				  areq->iv, AES_BLOCK_SIZE, qat_req);
+	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->assoc, areq->assoclen,
+				  areq->src, areq->dst, areq->iv,
+				  AES_BLOCK_SIZE, qat_req);
 	if (unlikely(ret))
 		return ret;
 
@@ -889,8 +896,9 @@ static int qat_alg_aead_enc_internal(struct aead_request *areq, uint8_t *iv,
 	struct icp_qat_fw_la_bulk_req *msg;
 	int ret, ctr = 0;
 
-	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->assoc, areq->src, areq->dst,
-				  iv, AES_BLOCK_SIZE, qat_req);
+	ret = qat_alg_sgl_to_bufl(ctx->inst, areq->assoc, areq->assoclen,
+				  areq->src, areq->dst, iv, AES_BLOCK_SIZE,
+				  qat_req);
 	if (unlikely(ret))
 		return ret;
 
@@ -1017,7 +1025,7 @@ static int qat_alg_ablkcipher_encrypt(struct ablkcipher_request *req)
 	struct icp_qat_fw_la_bulk_req *msg;
 	int ret, ctr = 0;
 
-	ret = qat_alg_sgl_to_bufl(ctx->inst, NULL, req->src, req->dst,
+	ret = qat_alg_sgl_to_bufl(ctx->inst, NULL, 0, req->src, req->dst,
 				  NULL, 0, qat_req);
 	if (unlikely(ret))
 		return ret;
@@ -1055,7 +1063,7 @@ static int qat_alg_ablkcipher_decrypt(struct ablkcipher_request *req)
 	struct icp_qat_fw_la_bulk_req *msg;
 	int ret, ctr = 0;
 
-	ret = qat_alg_sgl_to_bufl(ctx->inst, NULL, req->src, req->dst,
+	ret = qat_alg_sgl_to_bufl(ctx->inst, NULL, 0, req->src, req->dst,
 				  NULL, 0, qat_req);
 	if (unlikely(ret))
 		return ret;