ax25: fix possible use-after-free

[thirdparty/kernel/stable.git] / include / net / ax25.h

diff --git a/include/net/ax25.h b/include/net/ax25.h
index 3f9aea8087e3c823cdd5a22530ed4b25dd7621e1..8b7eb46ad72d8804c1ffaa3943bb2816113239d8 100644 (file)
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -201,6 +201,18 @@ static inline void ax25_hold_route(ax25_route *ax25_rt)
 
 void __ax25_put_route(ax25_route *ax25_rt);
 
+extern rwlock_t ax25_route_lock;
+
+static inline void ax25_route_lock_use(void)
+{
+       read_lock(&ax25_route_lock);
+}
+
+static inline void ax25_route_lock_unuse(void)
+{
+       read_unlock(&ax25_route_lock);
+}
+
 static inline void ax25_put_route(ax25_route *ax25_rt)
 {
        if (refcount_dec_and_test(&ax25_rt->refcount))