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net, l2tp: convert l2tp_session.ref_count from atomic_t to refcount_t

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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>
This commit is contained in:
Reshetova, Elena
2017-07-04 15:52:58 +03:00
committed by David S. Miller
parent fbea9e0760
commit f00c854c96
2 changed files with 6 additions and 6 deletions
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2
net/l2tp/l2tp_core.c
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@ -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 */