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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-06-30 13:08:01 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-01 07:39:08 -0700 |
| commit | 41c6d650f6537e55a1b53438c646fbc3f49176bf (patch) | |
| tree | d7fb3d5a2f1b3fb0fe76fa010141be563488d36b /net/llc | |
| parent | 14afee4b6092fde451ee17604e5f5c89da33e71e (diff) | |
| download | linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.tar.gz linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.tar.bz2 linux-41c6d650f6537e55a1b53438c646fbc3f49176bf.zip | |
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')
| -rw-r--r-- | net/llc/llc_conn.c | 8 | ||||
| -rw-r--r-- | net/llc/llc_sap.c | 2 |
2 files changed, 5 insertions, 5 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 { diff --git a/net/llc/llc_sap.c b/net/llc/llc_sap.c index 63b6ab056370..d90928f50226 100644 --- a/net/llc/llc_sap.c +++ b/net/llc/llc_sap.c @@ -329,7 +329,7 @@ again: sk_nulls_for_each_rcu(rc, node, laddr_hb) { if (llc_dgram_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_dgram_match(sap, laddr, rc))) { |