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From:   Giovanni Cabiddu <giovanni.cabiddu@intel.com>
To:     herbert@gondor.apana.org.au
Cc:     linux-crypto@vger.kernel.org, qat-linux@intel.com,
        Hareshx Sankar Raj <hareshx.sankar.raj@intel.com>,
        Bolemx Sivanagaleela <bolemx.sivanagaleela@intel.com>,
        Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Subject: [PATCH 1/2] crypto: qat - unmap buffer before free for DH
Date:   Thu,  1 Jun 2023 11:09:59 +0100
Message-Id: <20230601101000.18293-2-giovanni.cabiddu@intel.com>
In-Reply-To: <20230601101000.18293-1-giovanni.cabiddu@intel.com>
References: <20230601101000.18293-1-giovanni.cabiddu@intel.com>
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From: Hareshx Sankar Raj <hareshx.sankar.raj@intel.com>

The callback function for DH frees the memory allocated for the
destination buffer before unmapping it.
This sequence is wrong.

Change the cleanup sequence to unmap the buffer before freeing it.

Fixes: 029aa4624a7f ("crypto: qat - remove dma_free_coherent() for DH")
Signed-off-by: Hareshx Sankar Raj <hareshx.sankar.raj@intel.com>
Co-developed-by: Bolemx Sivanagaleela <bolemx.sivanagaleela@intel.com>
Signed-off-by: Bolemx Sivanagaleela <bolemx.sivanagaleela@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
---
 drivers/crypto/intel/qat/qat_common/qat_asym_algs.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/crypto/intel/qat/qat_common/qat_asym_algs.c b/drivers/crypto/intel/qat/qat_common/qat_asym_algs.c
index 935a7e012946..8806242469a0 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_asym_algs.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_asym_algs.c
@@ -170,15 +170,14 @@ static void qat_dh_cb(struct icp_qat_fw_pke_resp *resp)
 	}
 
 	areq->dst_len = req->ctx.dh->p_size;
+	dma_unmap_single(dev, req->out.dh.r, req->ctx.dh->p_size,
+			 DMA_FROM_DEVICE);
 	if (req->dst_align) {
 		scatterwalk_map_and_copy(req->dst_align, areq->dst, 0,
 					 areq->dst_len, 1);
 		kfree_sensitive(req->dst_align);
 	}
 
-	dma_unmap_single(dev, req->out.dh.r, req->ctx.dh->p_size,
-			 DMA_FROM_DEVICE);
-
 	dma_unmap_single(dev, req->phy_in, sizeof(struct qat_dh_input_params),
 			 DMA_TO_DEVICE);
 	dma_unmap_single(dev, req->phy_out,
-- 
2.40.1