diff options
| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 15:52:58 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-05 00:35:15 +0300 |
| commit | f00c854c965fd7197c9ac0f59d823ca0a909e33b (patch) | |
| tree | 032868128119ee633825680a74ade30c1a029a36 | |
| parent | fbea9e0760bf17e681b9bfc25b97b408708b9ff2 (diff) | |
| download | linux-f00c854c965fd7197c9ac0f59d823ca0a909e33b.tar.xz | |
net, l2tp: convert l2tp_session.ref_count 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.
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>
| -rw-r--r-- | net/l2tp/l2tp_core.c | 2 | ||||
| -rw-r--r-- | net/l2tp/l2tp_core.h | 10 |
2 files changed, 6 insertions, 6 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c index 203c4aa3e916..b0c2d4ae781d 100644 --- a/net/l2tp/l2tp_core.c +++ b/net/l2tp/l2tp_core.c @@ -1854,7 +1854,7 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn /* Bump the reference count. The session context is deleted * only when this drops to zero. */ - l2tp_session_inc_refcount(session); + refcount_set(&session->ref_count, 1); l2tp_tunnel_inc_refcount(tunnel); /* Ensure tunnel socket isn't deleted */ diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h index da58fad2451b..cdb6e3327f74 100644 --- a/net/l2tp/l2tp_core.h +++ b/net/l2tp/l2tp_core.h @@ -99,7 +99,7 @@ struct l2tp_session { int nr_oos_count; /* For OOS recovery */ int nr_oos_count_max; struct hlist_node hlist; /* Hash list node */ - atomic_t ref_count; + refcount_t ref_count; char name[32]; /* for logging */ char ifname[IFNAMSIZ]; @@ -274,12 +274,12 @@ int l2tp_ioctl(struct sock *sk, int cmd, unsigned long arg); */ static inline void l2tp_session_inc_refcount_1(struct l2tp_session *session) { - atomic_inc(&session->ref_count); + refcount_inc(&session->ref_count); } static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session) { - if (atomic_dec_and_test(&session->ref_count)) + if (refcount_dec_and_test(&session->ref_count)) l2tp_session_free(session); } @@ -288,14 +288,14 @@ static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session) do { \ pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", \ __func__, __LINE__, (_s)->name, \ - atomic_read(&_s->ref_count)); \ + refcount_read(&_s->ref_count)); \ l2tp_session_inc_refcount_1(_s); \ } while (0) #define l2tp_session_dec_refcount(_s) \ do { \ pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", \ __func__, __LINE__, (_s)->name, \ - atomic_read(&_s->ref_count)); \ + refcount_read(&_s->ref_count)); \ l2tp_session_dec_refcount_1(_s); \ } while (0) #else |