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sctp: use crypto_shash_tfm_digest()

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Instead of manually allocating a 'struct shash_desc' on the stack and
calling crypto_shash_digest(), switch to using the new helper function
crypto_shash_tfm_digest() which does this for us.

Cc: linux-sctp@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Eric Biggers 2020-05-01 22:31:20 -07:00 • committed by Herbert Xu
parent ec0bf6edc4
commit 75b93c6354
2 changed files with 10 additions and 23 deletions
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23
net/sctp/sm_make_chunk.c
View file

@ -1666,17 +1666,14 @@ static struct sctp_cookie_param *sctp_pack_cookie(
ntohs(init_chunk->chunk_hdr->length), raw_addrs, addrs_len);
if (sctp_sk(ep->base.sk)->hmac) {
SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac;
int err;
/* Sign the message. */
desc->tfm = sctp_sk(ep->base.sk)->hmac;
err = crypto_shash_setkey(desc->tfm, ep->secret_key,
err = crypto_shash_setkey(tfm, ep->secret_key,
sizeof(ep->secret_key)) ?:
crypto_shash_digest(desc, (u8 *)&cookie->c, bodysize,
cookie->signature);
shash_desc_zero(desc);
crypto_shash_tfm_digest(tfm, (u8 *)&cookie->c, bodysize,
cookie->signature);
if (err)
goto free_cookie;
}
@ -1737,17 +1734,13 @@ struct sctp_association *sctp_unpack_cookie(
/* Check the signature. */
{
SHASH_DESC_ON_STACK(desc, sctp_sk(ep->base.sk)->hmac);
struct crypto_shash *tfm = sctp_sk(ep->base.sk)->hmac;
int err;
desc->tfm = sctp_sk(ep->base.sk)->hmac;
err = crypto_shash_setkey(desc->tfm, ep->secret_key,
err = crypto_shash_setkey(tfm, ep->secret_key,
sizeof(ep->secret_key)) ?:
crypto_shash_digest(desc, (u8 *)bear_cookie, bodysize,
digest);
shash_desc_zero(desc);
crypto_shash_tfm_digest(tfm, (u8 *)bear_cookie, bodysize,
digest);
if (err) {
*error = -SCTP_IERROR_NOMEM;
goto fail;