diff options
| author | Tom Lendacky <thomas.lendacky@amd.com> | 2014-01-06 23:34:11 +0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-01-15 07:33:36 +0400 |
| commit | 393897c5156a415533ff85aa381458840417b032 (patch) | |
| tree | 352d1e73a038f3496814406f917690232772a609 /drivers/crypto/ccp/ccp-crypto-sha.c | |
| parent | 77dc4a51a9d3386c318c1622fc126964f7cb0ee2 (diff) | |
| download | linux-393897c5156a415533ff85aa381458840417b032.tar.xz | |
crypto: ccp - Check for caller result area before using it
For a hash operation, the caller doesn't have to supply a result
area on every call so don't use it / update it if it hasn't
been supplied.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/ccp/ccp-crypto-sha.c')
| -rw-r--r-- | drivers/crypto/ccp/ccp-crypto-sha.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-sha.c b/drivers/crypto/ccp/ccp-crypto-sha.c index bf913cbb3e96..183d16e46d20 100644 --- a/drivers/crypto/ccp/ccp-crypto-sha.c +++ b/drivers/crypto/ccp/ccp-crypto-sha.c @@ -74,6 +74,7 @@ static int ccp_sha_finish_hmac(struct crypto_async_request *async_req) struct ahash_request *req = ahash_request_cast(async_req); struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct ccp_ctx *ctx = crypto_ahash_ctx(tfm); + struct ccp_sha_req_ctx *rctx = ahash_request_ctx(req); struct scatterlist sg[2]; unsigned int block_size = crypto_tfm_alg_blocksize(crypto_ahash_tfm(tfm)); @@ -81,7 +82,7 @@ static int ccp_sha_finish_hmac(struct crypto_async_request *async_req) sg_init_table(sg, ARRAY_SIZE(sg)); sg_set_buf(&sg[0], ctx->u.sha.opad, block_size); - sg_set_buf(&sg[1], req->result, digest_size); + sg_set_buf(&sg[1], rctx->ctx, digest_size); return ccp_sync_hash(ctx->u.sha.hmac_tfm, req->result, sg, block_size + digest_size); @@ -106,7 +107,9 @@ static int ccp_sha_complete(struct crypto_async_request *async_req, int ret) } else rctx->buf_count = 0; - memcpy(req->result, rctx->ctx, digest_size); + /* Update result area if supplied */ + if (req->result) + memcpy(req->result, rctx->ctx, digest_size); /* If we're doing an HMAC, we need to perform that on the final op */ if (rctx->final && ctx->u.sha.key_len) |