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[PATCH 1/7] crypto: marvell: check return value of sg_nents_for_len

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  [PATCH 1/7] crypto: marvell: check return value of sg_nents_for_len LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-11-04 21:20 +0100
    [PATCH 2/7] crypto: talitos: check return value of sg_nents_for_len LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-11-04 21:20 +0100
    [PATCH 5/7] crypto: picoxcell: check return value of sg_nents_for_len LABBE Corentin <clabbe.montjoie@gmail.com> - 2015-11-04 21:20 +0100
      Re: [PATCH 5/7] crypto: picoxcell: check return value of  sg_nents_for_len Jamie Iles <jamie@jamieiles.com> - 2015-11-06 16:40 +0100

#1262566 — [PATCH 1/7] crypto: marvell: check return value of sg_nents_for_len

The sg_nents_for_len() function could fail, this patch add a check for
its return value.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
 drivers/crypto/marvell/cipher.c | 8 ++++++++
 drivers/crypto/marvell/hash.c   | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/crypto/marvell/cipher.c b/drivers/crypto/marvell/cipher.c
index 3df2f4e..78cf6f9 100644
--- a/drivers/crypto/marvell/cipher.c
+++ b/drivers/crypto/marvell/cipher.c
@@ -400,7 +400,15 @@ static int mv_cesa_ablkcipher_req_init(struct ablkcipher_request *req,
 		return -EINVAL;
 
 	creq->src_nents = sg_nents_for_len(req->src, req->nbytes);
+	if (creq->src_nents < 0) {
+		dev_err(cesa_dev->dev, "Invalid number of src SG");
+		return creq->src_nents;
+	}
 	creq->dst_nents = sg_nents_for_len(req->dst, req->nbytes);
+	if (creq->dst_nents < 0) {
+		dev_err(cesa_dev->dev, "Invalid number of dst SG");
+		return creq->dst_nents;
+	}
 
 	mv_cesa_update_op_cfg(tmpl, CESA_SA_DESC_CFG_OP_CRYPT_ONLY,
 			      CESA_SA_DESC_CFG_OP_MSK);
diff --git a/drivers/crypto/marvell/hash.c b/drivers/crypto/marvell/hash.c
index e8d0d71..250c6e5 100644
--- a/drivers/crypto/marvell/hash.c
+++ b/drivers/crypto/marvell/hash.c
@@ -710,6 +710,10 @@ static int mv_cesa_ahash_req_init(struct ahash_request *req, bool *cached)
 		creq->req.base.type = CESA_STD_REQ;
 
 	creq->src_nents = sg_nents_for_len(req->src, req->nbytes);
+	if (creq->src_nents < 0) {
+		dev_err(cesa_dev->dev, "Invalid number of src SG");
+		return creq->src_nents;
+	}
 
 	ret = mv_cesa_ahash_cache_req(req, cached);
 	if (ret)
-- 
2.4.10

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#1262568 — [PATCH 2/7] crypto: talitos: check return value of sg_nents_for_len

The sg_nents_for_len() function could fail, this patch add a check for
its return value.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
 drivers/crypto/talitos.c | 41 ++++++++++++++++++++++++++++++++++-------
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/talitos.c b/drivers/crypto/talitos.c
index 46f531e..898ab6c 100644
--- a/drivers/crypto/talitos.c
+++ b/drivers/crypto/talitos.c
@@ -1216,6 +1216,7 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
 	struct talitos_private *priv = dev_get_drvdata(dev);
 	bool is_sec1 = has_ftr_sec1(priv);
 	int max_len = is_sec1 ? TALITOS1_MAX_DATA_LEN : TALITOS2_MAX_DATA_LEN;
+	void *err;
 
 	if (cryptlen + authsize > max_len) {
 		dev_err(dev, "length exceeds h/w max limit\n");
@@ -1228,14 +1229,29 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
 	if (!dst || dst == src) {
 		src_nents = sg_nents_for_len(src,
 					     assoclen + cryptlen + authsize);
+		if (src_nents < 0) {
+			dev_err(dev, "Invalid number of src SG.\n");
+			err = ERR_PTR(-EINVAL);
+			goto error_sg;
+		}
 		src_nents = (src_nents == 1) ? 0 : src_nents;
 		dst_nents = dst ? src_nents : 0;
 	} else { /* dst && dst != src*/
 		src_nents = sg_nents_for_len(src, assoclen + cryptlen +
 						 (encrypt ? 0 : authsize));
+		if (src_nents < 0) {
+			dev_err(dev, "Invalid number of src SG.\n");
+			err = ERR_PTR(-EINVAL);
+			goto error_sg;
+		}
 		src_nents = (src_nents == 1) ? 0 : src_nents;
 		dst_nents = sg_nents_for_len(dst, assoclen + cryptlen +
 						 (encrypt ? authsize : 0));
+		if (dst_nents < 0) {
+			dev_err(dev, "Invalid number of dst SG.\n");
+			err = ERR_PTR(-EINVAL);
+			goto error_sg;
+		}
 		dst_nents = (dst_nents == 1) ? 0 : dst_nents;
 	}
 
@@ -1260,11 +1276,9 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
 
 	edesc = kmalloc(alloc_len, GFP_DMA | flags);
 	if (!edesc) {
-		if (iv_dma)
-			dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
-
 		dev_err(dev, "could not allocate edescriptor\n");
-		return ERR_PTR(-ENOMEM);
+		err = ERR_PTR(-ENOMEM);
+		goto error_sg;
 	}
 
 	edesc->src_nents = src_nents;
@@ -1277,6 +1291,10 @@ static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
 						     DMA_BIDIRECTIONAL);
 
 	return edesc;
+error_sg:
+	if (iv_dma)
+		dma_unmap_single(dev, iv_dma, ivsize, DMA_TO_DEVICE);
+	return err;
 }
 
 static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq, u8 *iv,
@@ -1830,11 +1848,16 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
 	unsigned int nbytes_to_hash;
 	unsigned int to_hash_later;
 	unsigned int nsg;
+	int nents;
 
 	if (!req_ctx->last && (nbytes + req_ctx->nbuf <= blocksize)) {
 		/* Buffer up to one whole block */
-		sg_copy_to_buffer(areq->src,
-				  sg_nents_for_len(areq->src, nbytes),
+		nents = sg_nents_for_len(areq->src, nbytes);
+		if (nents < 0) {
+			dev_err(ctx->dev, "Invalid number of src SG.\n");
+			return nents;
+		}
+		sg_copy_to_buffer(areq->src, nents,
 				  req_ctx->buf + req_ctx->nbuf, nbytes);
 		req_ctx->nbuf += nbytes;
 		return 0;
@@ -1867,7 +1890,11 @@ static int ahash_process_req(struct ahash_request *areq, unsigned int nbytes)
 		req_ctx->psrc = areq->src;
 
 	if (to_hash_later) {
-		int nents = sg_nents_for_len(areq->src, nbytes);
+		nents = sg_nents_for_len(areq->src, nbytes);
+		if (nents < 0) {
+			dev_err(ctx->dev, "Invalid number of src SG.\n");
+			return nents;
+		}
 		sg_pcopy_to_buffer(areq->src, nents,
 				      req_ctx->bufnext,
 				      to_hash_later,
-- 
2.4.10

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#1262570 — [PATCH 5/7] crypto: picoxcell: check return value of sg_nents_for_len

The sg_nents_for_len() function could fail, this patch add a check for
its return value.
In the same time, we remove sg_count() as it is used as an alias of
sg_nents_for_len.

Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>
---
 drivers/crypto/picoxcell_crypto.c | 48 +++++++++++++++++++++++++++------------
 1 file changed, 34 insertions(+), 14 deletions(-)

diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c
index da36de2..1b16eb28 100644
--- a/drivers/crypto/picoxcell_crypto.c
+++ b/drivers/crypto/picoxcell_crypto.c
@@ -272,12 +272,6 @@ static unsigned spacc_load_ctx(struct spacc_generic_ctx *ctx,
 	return indx;
 }
 
-/* Count the number of scatterlist entries in a scatterlist. */
-static inline int sg_count(struct scatterlist *sg_list, int nbytes)
-{
-	return sg_nents_for_len(sg_list, nbytes);
-}
-
 static inline void ddt_set(struct spacc_ddt *ddt, dma_addr_t phys, size_t len)
 {
 	ddt->p = phys;
@@ -300,7 +294,11 @@ static struct spacc_ddt *spacc_sg_to_ddt(struct spacc_engine *engine,
 	struct spacc_ddt *ddt;
 	int i;
 
-	nents = sg_count(payload, nbytes);
+	nents = sg_nents_for_len(payload, nbytes);
+	if (nents < 0) {
+		dev_err(engine->dev, "Invalid numbers of SG.\n");
+		return NULL;
+	}
 	mapped_ents = dma_map_sg(engine->dev, payload, nents, dir);
 
 	if (mapped_ents + 1 > MAX_DDT_LEN)
@@ -336,13 +334,21 @@ static int spacc_aead_make_ddts(struct aead_request *areq)
 	if (req->is_encrypt)
 		total += crypto_aead_authsize(aead);
 
-	src_nents = sg_count(areq->src, total);
+	src_nents = sg_nents_for_len(areq->src, total);
+	if (src_nents < 0) {
+		dev_err(engine->dev, "Invalid numbers of src SG.\n");
+		return src_nents;
+	}
 	if (src_nents + 1 > MAX_DDT_LEN)
 		return -E2BIG;
 
 	dst_nents = 0;
 	if (areq->src != areq->dst) {
-		dst_nents = sg_count(areq->dst, total);
+		dst_nents = sg_nents_for_len(areq->dst, total);
+		if (dst_nents < 0) {
+			dev_err(engine->dev, "Invalid numbers of dst SG.\n");
+			return dst_nents;
+		}
 		if (src_nents + 1 > MAX_DDT_LEN)
 			return -E2BIG;
 	}
@@ -422,13 +428,22 @@ static void spacc_aead_free_ddts(struct spacc_req *req)
 			 (req->is_encrypt ? crypto_aead_authsize(aead) : 0);
 	struct spacc_aead_ctx *aead_ctx = crypto_aead_ctx(aead);
 	struct spacc_engine *engine = aead_ctx->generic.engine;
-	unsigned nents = sg_count(areq->src, total);
+	int nents = sg_nents_for_len(areq->src, total);
+
+	/* sg_nents_for_len should not fail since it works when mapping sg */
+	if (unlikely(nents < 0)) {
+		dev_err(engine->dev, "Invalid numbers of src SG.\n");
+		return;
+	}
 
 	if (areq->src != areq->dst) {
 		dma_unmap_sg(engine->dev, areq->src, nents, DMA_TO_DEVICE);
-		dma_unmap_sg(engine->dev, areq->dst,
-			     sg_count(areq->dst, total),
-			     DMA_FROM_DEVICE);
+		nents = sg_nents_for_len(areq->dst, total);
+		if (unlikely(nents < 0)) {
+			dev_err(engine->dev, "Invalid numbers of dst SG.\n");
+			return;
+		}
+		dma_unmap_sg(engine->dev, areq->dst, nents, DMA_FROM_DEVICE);
 	} else
 		dma_unmap_sg(engine->dev, areq->src, nents, DMA_BIDIRECTIONAL);
 
@@ -440,7 +455,12 @@ static void spacc_free_ddt(struct spacc_req *req, struct spacc_ddt *ddt,
 			   dma_addr_t ddt_addr, struct scatterlist *payload,
 			   unsigned nbytes, enum dma_data_direction dir)
 {
-	unsigned nents = sg_count(payload, nbytes);
+	int nents = sg_nents_for_len(payload, nbytes);
+
+	if (nents < 0) {
+		dev_err(req->engine->dev, "Invalid numbers of SG.\n");
+		return;
+	}
 
 	dma_unmap_sg(req->engine->dev, payload, nents, dir);
 	dma_pool_free(req->engine->req_pool, ddt, ddt_addr);
-- 
2.4.10

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#1264095 — Re: [PATCH 5/7] crypto: picoxcell: check return value of sg_nents_for_len

On Wed, Nov 04, 2015 at 09:13:37PM +0100, LABBE Corentin wrote:
> The sg_nents_for_len() function could fail, this patch add a check for
> its return value.
> In the same time, we remove sg_count() as it is used as an alias of
> sg_nents_for_len.
> 
> Signed-off-by: LABBE Corentin <clabbe.montjoie@gmail.com>

Acked-by: Jamie Iles <jamie@jamieiles.com>

thanks for doing this!

Jamie
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