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authorReshetova, Elena <elena.reshetova@intel.com>2017-06-30 13:08:01 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-01 07:39:08 -0700
commit41c6d650f6537e55a1b53438c646fbc3f49176bf (patch)
treed7fb3d5a2f1b3fb0fe76fa010141be563488d36b /net/llc/llc_conn.c
parent14afee4b6092fde451ee17604e5f5c89da33e71e (diff)
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net: convert sock.sk_refcnt from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. This patch uses refcount_inc_not_zero() instead of atomic_inc_not_zero_hint() due to absense of a _hint() version of refcount API. If the hint() version must be used, we might need to revisit API. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/llc/llc_conn.c')
-rw-r--r--net/llc/llc_conn.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/net/llc/llc_conn.c b/net/llc/llc_conn.c
index 9b02c13d258b..5e91b47f0d2a 100644
--- a/net/llc/llc_conn.c
+++ b/net/llc/llc_conn.c
@@ -507,7 +507,7 @@ again:
sk_nulls_for_each_rcu(rc, node, laddr_hb) {
if (llc_estab_match(sap, daddr, laddr, rc)) {
/* Extra checks required by SLAB_TYPESAFE_BY_RCU */
- if (unlikely(!atomic_inc_not_zero(&rc->sk_refcnt)))
+ if (unlikely(!refcount_inc_not_zero(&rc->sk_refcnt)))
goto again;
if (unlikely(llc_sk(rc)->sap != sap ||
!llc_estab_match(sap, daddr, laddr, rc))) {
@@ -566,7 +566,7 @@ again:
sk_nulls_for_each_rcu(rc, node, laddr_hb) {
if (llc_listener_match(sap, laddr, rc)) {
/* Extra checks required by SLAB_TYPESAFE_BY_RCU */
- if (unlikely(!atomic_inc_not_zero(&rc->sk_refcnt)))
+ if (unlikely(!refcount_inc_not_zero(&rc->sk_refcnt)))
goto again;
if (unlikely(llc_sk(rc)->sap != sap ||
!llc_listener_match(sap, laddr, rc))) {
@@ -973,9 +973,9 @@ void llc_sk_free(struct sock *sk)
skb_queue_purge(&sk->sk_write_queue);
skb_queue_purge(&llc->pdu_unack_q);
#ifdef LLC_REFCNT_DEBUG
- if (atomic_read(&sk->sk_refcnt) != 1) {
+ if (refcount_read(&sk->sk_refcnt) != 1) {
printk(KERN_DEBUG "Destruction of LLC sock %p delayed in %s, cnt=%d\n",
- sk, __func__, atomic_read(&sk->sk_refcnt));
+ sk, __func__, refcount_read(&sk->sk_refcnt));
printk(KERN_DEBUG "%d LLC sockets are still alive\n",
atomic_read(&llc_sock_nr));
} else {