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>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c
index 615da96..a9c6367 100644 (file)
--- 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);