Received-SPF: pass (google.com: domain of linux-crypto-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Giovanni Cabiddu <giovanni.cabiddu@intel.com>
To:     herbert@gondor.apana.org.au
Cc:     linux-crypto@vger.kernel.org, qat-linux@intel.com,
        Vlad Dronov <vdronov@redhat.com>,
        Damian Muszynski <damian.muszynski@intel.com>,
        Giovanni Cabiddu <giovanni.cabiddu@intel.com>,
        Adam Guerin <adam.guerin@intel.com>
Subject: [PATCH 3/3] crypto: qat - use reference to structure in dma_map_single()
Date:   Fri,  9 Sep 2022 11:49:14 +0100
Message-Id: <20220909104914.3351-4-giovanni.cabiddu@intel.com>
In-Reply-To: <20220909104914.3351-1-giovanni.cabiddu@intel.com>
References: <20220909104914.3351-1-giovanni.cabiddu@intel.com>
MIME-Version: 1.0
Organization: Intel Research and Development Ireland Ltd - Co. Reg. #308263 - Collinstown Industrial Park, Leixlip, County Kildare - Ireland
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Damian Muszynski <damian.muszynski@intel.com>

When mapping the input and output parameters, the implementations of RSA
and DH pass to the function dma_map_single() a pointer to the first
member of the structure they want to map instead of a pointer to the
actual structure.
This results in set of warnings reported by the static analyser Smatch:

    drivers/crypto/qat/qat_common/qat_asym_algs.c:335 qat_dh_compute_value() error: dma_map_single_attrs() '&qat_req->in.dh.in.b' too small (8 vs 64)
    drivers/crypto/qat/qat_common/qat_asym_algs.c:341 qat_dh_compute_value() error: dma_map_single_attrs() '&qat_req->out.dh.r' too small (8 vs 64)
    drivers/crypto/qat/qat_common/qat_asym_algs.c:732 qat_rsa_enc() error: dma_map_single_attrs() '&qat_req->in.rsa.enc.m' too small (8 vs 64)
    drivers/crypto/qat/qat_common/qat_asym_algs.c:738 qat_rsa_enc() error: dma_map_single_attrs() '&qat_req->out.rsa.enc.c' too small (8 vs 64)
    drivers/crypto/qat/qat_common/qat_asym_algs.c:878 qat_rsa_dec() error: dma_map_single_attrs() '&qat_req->in.rsa.dec.c' too small (8 vs 64)
    drivers/crypto/qat/qat_common/qat_asym_algs.c:884 qat_rsa_dec() error: dma_map_single_attrs() '&qat_req->out.rsa.dec.m' too small (8 vs 64)

Where the address of the first element of a structure is used as an
input for the function dma_map_single(), replace it with the address of
the structure. This fix does not introduce any functional change as the
addresses are the same.

Signed-off-by: Damian Muszynski <damian.muszynski@intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Adam Guerin <adam.guerin@intel.com>
---
 drivers/crypto/qat/qat_common/qat_asym_algs.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/qat/qat_common/qat_asym_algs.c b/drivers/crypto/qat/qat_common/qat_asym_algs.c
index 85b0f30712e1..94a26702aeae 100644
--- a/drivers/crypto/qat/qat_common/qat_asym_algs.c
+++ b/drivers/crypto/qat/qat_common/qat_asym_algs.c
@@ -332,13 +332,13 @@ static int qat_dh_compute_value(struct kpp_request *req)
 	qat_req->in.dh.in_tab[n_input_params] = 0;
 	qat_req->out.dh.out_tab[1] = 0;
 	/* Mapping in.in.b or in.in_g2.xa is the same */
-	qat_req->phy_in = dma_map_single(dev, &qat_req->in.dh.in.b,
+	qat_req->phy_in = dma_map_single(dev, &qat_req->in.dh,
 					 sizeof(struct qat_dh_input_params),
 					 DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
 		goto unmap_dst;
 
-	qat_req->phy_out = dma_map_single(dev, &qat_req->out.dh.r,
+	qat_req->phy_out = dma_map_single(dev, &qat_req->out.dh,
 					  sizeof(struct qat_dh_output_params),
 					  DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
@@ -729,13 +729,13 @@ static int qat_rsa_enc(struct akcipher_request *req)
 
 	qat_req->in.rsa.in_tab[3] = 0;
 	qat_req->out.rsa.out_tab[1] = 0;
-	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa.enc.m,
+	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa,
 					 sizeof(struct qat_rsa_input_params),
 					 DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
 		goto unmap_dst;
 
-	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa.enc.c,
+	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa,
 					  sizeof(struct qat_rsa_output_params),
 					  DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
@@ -875,13 +875,13 @@ static int qat_rsa_dec(struct akcipher_request *req)
 	else
 		qat_req->in.rsa.in_tab[3] = 0;
 	qat_req->out.rsa.out_tab[1] = 0;
-	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa.dec.c,
+	qat_req->phy_in = dma_map_single(dev, &qat_req->in.rsa,
 					 sizeof(struct qat_rsa_input_params),
 					 DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_in)))
 		goto unmap_dst;
 
-	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa.dec.m,
+	qat_req->phy_out = dma_map_single(dev, &qat_req->out.rsa,
 					  sizeof(struct qat_rsa_output_params),
 					  DMA_TO_DEVICE);
 	if (unlikely(dma_mapping_error(dev, qat_req->phy_out)))
-- 
2.37.1