From 2431f0da543e8c93333ed3b3c8ab9a1158404959 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Fri, 29 Dec 2017 10:00:46 -0600 Subject: 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 Signed-off-by: Herbert Xu --- crypto/crypto_user.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'crypto/crypto_user.c') diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c index 0dbe2be7..5c291eed 100644 --- a/crypto/crypto_user.c +++ b/crypto/crypto_user.c @@ -169,7 +169,7 @@ static int crypto_report_one(struct crypto_alg *alg, ualg->cru_type = 0; ualg->cru_mask = 0; ualg->cru_flags = alg->cra_flags; - ualg->cru_refcnt = atomic_read(&alg->cra_refcnt); + ualg->cru_refcnt = refcount_read(&alg->cra_refcnt); if (nla_put_u32(skb, CRYPTOCFGA_PRIORITY_VAL, alg->cra_priority)) goto nla_put_failure; @@ -387,7 +387,7 @@ static int crypto_del_alg(struct sk_buff *skb, struct nlmsghdr *nlh, goto drop_alg; err = -EBUSY; - if (atomic_read(&alg->cra_refcnt) > 2) + if (refcount_read(&alg->cra_refcnt) > 2) goto drop_alg; err = crypto_unregister_instance((struct crypto_instance *)alg); -- cgit v1.2.3