net: convert inet_peer.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 conversion requires overall +1 on the whole
refcounting scheme.
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>
diff --git a/include/net/inetpeer.h b/include/net/inetpeer.h
index 235c781..f2a215f 100644
--- a/include/net/inetpeer.h
+++ b/include/net/inetpeer.h
@@ -46,7 +46,7 @@
struct rcu_head gc_rcu;
};
/*
- * Once inet_peer is queued for deletion (refcnt == -1), following field
+ * Once inet_peer is queued for deletion (refcnt == 0), following field
* is not available: rid
* We can share memory with rcu_head to help keep inet_peer small.
*/
@@ -60,7 +60,7 @@
/* following fields might be frequently dirtied */
__u32 dtime; /* the time of last use of not referenced entries */
- atomic_t refcnt;
+ refcount_t refcnt;
};
struct inet_peer_base {