crypto: rockchip - fix scatterlist nents error

commit 4359669a087633132203c52d67dd8c31e09e7b2e upstream.

In some cases, the nents of src scatterlist is different from
dst scatterlist. So two variables are used to handle the nents
of src&dst scatterlist.
Reported-by: NEric Biggers <ebiggers@google.com>
Fixes: 433cd2c6 ("crypto: rockchip - add crypto driver for rk3288")
Cc: <stable@vger.kernel.org> # v4.5+
Signed-off-by: NZhang Zhijie <zhangzj@rock-chips.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/crypto/rockchip/rk3288_crypto.c

@@ -119,7 +119,7 @@ static int rk_load_data(struct rk_crypto_info *dev,
 		count = (dev->left_bytes > PAGE_SIZE) ?
 			PAGE_SIZE : dev->left_bytes;
 
-		if (!sg_pcopy_to_buffer(dev->first, dev->nents,
+		if (!sg_pcopy_to_buffer(dev->first, dev->src_nents,
 					dev->addr_vir, count,
 					dev->total - dev->left_bytes)) {
 			dev_err(dev->dev, "[%s:%d] pcopy err\n",

drivers/crypto/rockchip/rk3288_crypto.h

@@ -207,7 +207,8 @@ struct rk_crypto_info {
 	void				*addr_vir;
 	int				aligned;
 	int				align_size;
-	size_t				nents;
+	size_t				src_nents;
+	size_t				dst_nents;
 	unsigned int			total;
 	unsigned int			count;
 	dma_addr_t			addr_in;

drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c

@@ -260,8 +260,9 @@ static int rk_ablk_start(struct rk_crypto_info *dev)
 	dev->total = req->nbytes;
 	dev->sg_src = req->src;
 	dev->first = req->src;
-	dev->nents = sg_nents(req->src);
+	dev->src_nents = sg_nents(req->src);
 	dev->sg_dst = req->dst;
+	dev->dst_nents = sg_nents(req->dst);
 	dev->aligned = 1;
 
 	spin_lock_irqsave(&dev->lock, flags);
@@ -297,7 +298,7 @@ static int rk_ablk_rx(struct rk_crypto_info *dev)
 
 	dev->unload_data(dev);
 	if (!dev->aligned) {
-		if (!sg_pcopy_from_buffer(req->dst, dev->nents,
+		if (!sg_pcopy_from_buffer(req->dst, dev->dst_nents,
 					  dev->addr_vir, dev->count,
 					  dev->total - dev->left_bytes -
 					  dev->count)) {

drivers/crypto/rockchip/rk3288_crypto_ahash.c

@@ -206,7 +206,7 @@ static int rk_ahash_start(struct rk_crypto_info *dev)
 	dev->sg_dst = NULL;
 	dev->sg_src = req->src;
 	dev->first = req->src;
-	dev->nents = sg_nents(req->src);
+	dev->src_nents = sg_nents(req->src);
 	rctx = ahash_request_ctx(req);
 	rctx->mode = 0;