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From:   Gilad Ben-Yossef <gilad@benyossef.com>
To:     gregkh@linuxfoundation.org,
        Herbert Xu <herbert@gondor.apana.org.au>,
        "David S. Miller" <davem@davemloft.net>
Cc:     stable@vger.kernel.org, linux-crypto@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [STABLE PATCH 1/2] crypto: ccree: zap entire sg on aead request unmap
Date:   Mon, 20 May 2019 14:50:23 +0300
Message-Id: <20190520115025.16457-2-gilad@benyossef.com>
In-Reply-To: <20190520115025.16457-1-gilad@benyossef.com>
References: <20190520115025.16457-1-gilad@benyossef.com>
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Sender: linux-crypto-owner@vger.kernel.org
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We were trying to be clever zapping out of the cache only the required
length out of scatter list on AEAD request completion and getting it
wrong.

As Knuth said: "when in douby, use brute force". Zap the whole length of
the scatter list.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
---
 drivers/crypto/ccree/cc_buffer_mgr.c | 18 ++----------------
 1 file changed, 2 insertions(+), 16 deletions(-)

diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
index 0ee1c52da0a4..0774bf54fcab 100644
--- a/drivers/crypto/ccree/cc_buffer_mgr.c
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -568,11 +568,7 @@ void cc_unmap_aead_request(struct device *dev, struct aead_request *req)
 {
 	struct aead_req_ctx *areq_ctx = aead_request_ctx(req);
 	unsigned int hw_iv_size = areq_ctx->hw_iv_size;
-	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
 	struct cc_drvdata *drvdata = dev_get_drvdata(dev);
-	u32 dummy;
-	bool chained;
-	u32 size_to_unmap = 0;
 
 	if (areq_ctx->mac_buf_dma_addr) {
 		dma_unmap_single(dev, areq_ctx->mac_buf_dma_addr,
@@ -629,22 +625,12 @@ void cc_unmap_aead_request(struct device *dev, struct aead_request *req)
 	dev_dbg(dev, "Unmapping src sgl: req->src=%pK areq_ctx->src.nents=%u areq_ctx->assoc.nents=%u assoclen:%u cryptlen=%u\n",
 		sg_virt(req->src), areq_ctx->src.nents, areq_ctx->assoc.nents,
 		req->assoclen, req->cryptlen);
-	size_to_unmap = req->assoclen + req->cryptlen;
-	if (areq_ctx->gen_ctx.op_type == DRV_CRYPTO_DIRECTION_ENCRYPT)
-		size_to_unmap += areq_ctx->req_authsize;
-	if (areq_ctx->is_gcm4543)
-		size_to_unmap += crypto_aead_ivsize(tfm);
 
-	dma_unmap_sg(dev, req->src,
-		     cc_get_sgl_nents(dev, req->src, size_to_unmap,
-				      &dummy, &chained),
-		     DMA_BIDIRECTIONAL);
+	dma_unmap_sg(dev, req->src, sg_nents(req->src), DMA_BIDIRECTIONAL);
 	if (req->src != req->dst) {
 		dev_dbg(dev, "Unmapping dst sgl: req->dst=%pK\n",
 			sg_virt(req->dst));
-		dma_unmap_sg(dev, req->dst,
-			     cc_get_sgl_nents(dev, req->dst, size_to_unmap,
-					      &dummy, &chained),
+		dma_unmap_sg(dev, req->dst, sg_nents(req->dst),
 			     DMA_BIDIRECTIONAL);
 	}
 	if (drvdata->coherent &&
-- 
2.21.0