net, ipx: convert ipx_interface.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.
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/ipx.h b/include/net/ipx.h
index e5cff68..2de1281 100644
--- a/include/net/ipx.h
+++ b/include/net/ipx.h
@@ -14,6 +14,7 @@
#include <linux/ipx.h>
#include <linux/list.h>
#include <linux/slab.h>
+#include <linux/refcount.h>
struct ipx_address {
__be32 net;
@@ -54,7 +55,7 @@ struct ipx_interface {
/* IPX address */
__be32 if_netnum;
unsigned char if_node[IPX_NODE_LEN];
- atomic_t refcnt;
+ refcount_t refcnt;
/* physical device info */
struct net_device *if_dev;
@@ -139,7 +140,7 @@ const char *ipx_device_name(struct ipx_interface *intrfc);
static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
{
- atomic_inc(&intrfc->refcnt);
+ refcount_inc(&intrfc->refcnt);
}
void ipxitf_down(struct ipx_interface *intrfc);
@@ -157,7 +158,7 @@ int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
{
- if (atomic_dec_and_test(&intrfc->refcnt))
+ if (refcount_dec_and_test(&intrfc->refcnt))
ipxitf_down(intrfc);
}