crypto: starfive - Pad adata with zeroes

Aad requires padding with zeroes up to 15 bytes in some cases. This
patch increases the allocated buffer size for aad and prevents the
driver accessing uninitialized memory region.

v1->v2: Specify reason for alloc size change in descriptions.
Signed-off-by: Jia Jie Ho <jiajie.ho@starfivetech.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/starfive/jh7110-aes.c

@@ -500,7 +500,7 @@ static int starfive_aes_prepare_req(struct skcipher_request *req,
 	scatterwalk_start(&cryp->out_walk, rctx->out_sg);
 
 	if (cryp->assoclen) {
-		rctx->adata = kzalloc(ALIGN(cryp->assoclen, AES_BLOCK_SIZE), GFP_KERNEL);
+		rctx->adata = kzalloc(cryp->assoclen + AES_BLOCK_SIZE, GFP_KERNEL);
 		if (!rctx->adata)
 			return dev_err_probe(cryp->dev, -ENOMEM,
 					     "Failed to alloc memory for adata");
@@ -569,7 +569,7 @@ static int starfive_aes_aead_do_one_req(struct crypto_engine *engine, void *areq
 	struct starfive_cryp_ctx *ctx =
 		crypto_aead_ctx(crypto_aead_reqtfm(req));
 	struct starfive_cryp_dev *cryp = ctx->cryp;
-	struct starfive_cryp_request_ctx *rctx = ctx->rctx;
+	struct starfive_cryp_request_ctx *rctx;
 	u32 block[AES_BLOCK_32];
 	u32 stat;
 	int err;
@@ -579,6 +579,8 @@ static int starfive_aes_aead_do_one_req(struct crypto_engine *engine, void *areq
 	if (err)
 		return err;
 
+	rctx = ctx->rctx;
+
 	if (!cryp->assoclen)
 		goto write_text;