[PATCH 16/18] net, ipx: convert ipx_route.refcnt from atomic_t to refcount_t

[Elena Reshetova]

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.reshet...@intel.com>
Signed-off-by: Hans Liljestrand <ishkam...@gmail.com>
Signed-off-by: Kees Cook <keesc...@chromium.org>
Signed-off-by: David Windsor <dwind...@gmail.com>
---
 include/net/ipx.h   | 6 +++---
 net/ipx/ipx_route.c | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/net/ipx.h b/include/net/ipx.h
index 2de1281..af32b97 100644
--- a/include/net/ipx.h
+++ b/include/net/ipx.h
@@ -81,7 +81,7 @@ struct ipx_route {
        unsigned char           ir_routed;
        unsigned char           ir_router_node[IPX_NODE_LEN];
        struct list_head        node; /* node in ipx_routes list */
-       atomic_t                refcnt;
+       refcount_t              refcnt;
 };
 
 struct ipx_cb {
@@ -164,12 +164,12 @@ static __inline__ void ipxitf_put(struct ipx_interface 
*intrfc)
 
 static __inline__ void ipxrtr_hold(struct ipx_route *rt)
 {
-               atomic_inc(&rt->refcnt);
+               refcount_inc(&rt->refcnt);
 }
 
 static __inline__ void ipxrtr_put(struct ipx_route *rt)
 {
-               if (atomic_dec_and_test(&rt->refcnt))
+               if (refcount_dec_and_test(&rt->refcnt))
                                        kfree(rt);
 }
 #endif /* _NET_INET_IPX_H_ */
diff --git a/net/ipx/ipx_route.c b/net/ipx/ipx_route.c
index 3e2a32a..b5d9144 100644
--- a/net/ipx/ipx_route.c
+++ b/net/ipx/ipx_route.c
@@ -59,7 +59,7 @@ int ipxrtr_add_route(__be32 network, struct ipx_interface 
*intrfc,
                if (!rt)
                        goto out;
 
-               atomic_set(&rt->refcnt, 1);
+               refcount_set(&rt->refcnt, 1);
                ipxrtr_hold(rt);
                write_lock_bh(&ipx_routes_lock);
                list_add(&rt->node, &ipx_routes);
-- 
2.7.4