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| author | Eric Biggers <ebiggers@google.com> | 2017-12-29 10:00:46 -0600 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-05 18:43:09 +1100 |
| commit | ce8614a312ef750bb60677bb13680cb27d1c284b (patch) | |
| tree | 842f01d86dc235bcd80c8544969d9fffeaec30c5 /crypto/algapi.c | |
| parent | 809778e02cd45d0625439fee67688f655627bb3c (diff) | |
| download | lwn-ce8614a312ef750bb60677bb13680cb27d1c284b.tar.gz lwn-ce8614a312ef750bb60677bb13680cb27d1c284b.zip | |
crypto: algapi - convert cra_refcnt to refcount_t
Reference counters should use refcount_t rather than atomic_t, since the
refcount_t implementation can prevent overflows, reducing the
exploitability of reference leak bugs. crypto_alg.cra_refcount is a
reference counter with the usual semantics, so switch it over to
refcount_t.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/algapi.c')
| -rw-r--r-- | crypto/algapi.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c index 60d7366ed343..8084a76e01d8 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -62,7 +62,7 @@ static int crypto_check_alg(struct crypto_alg *alg) if (alg->cra_priority < 0) return -EINVAL; - atomic_set(&alg->cra_refcnt, 1); + refcount_set(&alg->cra_refcnt, 1); return crypto_set_driver_name(alg); } @@ -224,7 +224,7 @@ static struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg) if (!larval->adult) goto free_larval; - atomic_set(&larval->alg.cra_refcnt, 1); + refcount_set(&larval->alg.cra_refcnt, 1); memcpy(larval->alg.cra_driver_name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); larval->alg.cra_priority = alg->cra_priority; @@ -399,7 +399,7 @@ int crypto_unregister_alg(struct crypto_alg *alg) if (ret) return ret; - BUG_ON(atomic_read(&alg->cra_refcnt) != 1); + BUG_ON(refcount_read(&alg->cra_refcnt) != 1); if (alg->cra_destroy) alg->cra_destroy(alg); @@ -490,7 +490,7 @@ void crypto_unregister_template(struct crypto_template *tmpl) up_write(&crypto_alg_sem); hlist_for_each_entry_safe(inst, n, list, list) { - BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); + BUG_ON(refcount_read(&inst->alg.cra_refcnt) != 1); crypto_free_instance(inst); } crypto_remove_final(&users); |