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crypto: ccm - Only access common skcipher fields on spawn 

As skcipher spawns may be of the type lskcipher, only the common
fields may be accessed.  This was already the case but use the
correct helpers to make this more obvious.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2023-10-03 11:43:25 +08:00
parent 24a285cea8
commit 60fa9a39ae
1 changed files with 4 additions and 5 deletions
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9
crypto/ccm.c
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@ -447,10 +447,10 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
const char *ctr_name,
const char *mac_name)
{
struct skcipher_alg_common *ctr;
u32 mask;
struct aead_instance *inst;
struct ccm_instance_ctx *ictx;
struct skcipher_alg *ctr;
struct hash_alg_common *mac;
int err;
@ -478,13 +478,12 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
ctr_name, 0, mask);
if (err)
goto err_free_inst;
ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
ctr = crypto_spawn_skcipher_alg_common(&ictx->ctr);
/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
err = -EINVAL;
if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
crypto_skcipher_alg_ivsize(ctr) != 16 ||
ctr->base.cra_blocksize != 1)
ctr->ivsize != 16 || ctr->base.cra_blocksize != 1)
goto err_free_inst;
/* ctr and cbcmac must use the same underlying block cipher. */
@ -507,7 +506,7 @@ static int crypto_ccm_create_common(struct crypto_template *tmpl,
inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
ctr->base.cra_alignmask;
inst->alg.ivsize = 16;
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
inst->alg.chunksize = ctr->chunksize;
inst->alg.maxauthsize = 16;
inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
inst->alg.init = crypto_ccm_init_tfm;