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crypto: gcm - Only access common skcipher fields on spawn

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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 11:43:29 +08:00
parent 7202e65b1e
commit 712c22aa59
1 changed files with 4 additions and 5 deletions
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9
crypto/gcm.c
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@ -576,10 +576,10 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
const char *ctr_name,
const char *ghash_name)
{
struct skcipher_alg_common *ctr;
u32 mask;
struct aead_instance *inst;
struct gcm_instance_ctx *ctx;
struct skcipher_alg *ctr;
struct hash_alg_common *ghash;
int err;
@ -607,13 +607,12 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
ctr_name, 0, mask);
if (err)
goto err_free_inst;
ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
ctr = crypto_spawn_skcipher_alg_common(&ctx->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;
err = -ENAMETOOLONG;
@ -634,7 +633,7 @@ static int crypto_gcm_create_common(struct crypto_template *tmpl,
ctr->base.cra_alignmask;
inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
inst->alg.ivsize = GCM_AES_IV_SIZE;
inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
inst->alg.chunksize = ctr->chunksize;
inst->alg.maxauthsize = 16;
inst->alg.init = crypto_gcm_init_tfm;
inst->alg.exit = crypto_gcm_exit_tfm;