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author | LABBE Corentin <clabbe.montjoie@gmail.com> | 2015-11-04 21:13:37 +0100 |
---|---|---|
committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-11-17 22:00:37 +0800 |
commit | f051f95eb47bb216ad0a8fbe64b4be179cc5abec (patch) | |
tree | 4cf479b4bce86933f752df2c98f30253065ae983 /drivers/crypto/picoxcell_crypto.c | |
parent | 4fa9948ca5bf308fabd5c9b584bf710f5d393859 (diff) | |
download | op-kernel-dev-f051f95eb47bb216ad0a8fbe64b4be179cc5abec.zip op-kernel-dev-f051f95eb47bb216ad0a8fbe64b4be179cc5abec.tar.gz |
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>
Diffstat (limited to 'drivers/crypto/picoxcell_crypto.c')
-rw-r--r-- | drivers/crypto/picoxcell_crypto.c | 48 |
1 files changed, 34 insertions, 14 deletions
diff --git a/drivers/crypto/picoxcell_crypto.c b/drivers/crypto/picoxcell_crypto.c index 615da96..a9c6367 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); |