net: convert net.passive 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 <[email protected]>
Signed-off-by: Hans Liljestrand <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David Windsor <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index a24a575..31a2b51 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -5,6 +5,7 @@
#define __NET_NET_NAMESPACE_H
#include <linux/atomic.h>
+#include <linux/refcount.h>
#include <linux/workqueue.h>
#include <linux/list.h>
#include <linux/sysctl.h>
@@ -46,7 +47,7 @@ struct netns_ipvs;
#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
struct net {
- atomic_t passive; /* To decided when the network
+ refcount_t passive; /* To decided when the network
* namespace should be freed.
*/
atomic_t count; /* To decided when the network
