[PATCH 34/36] net, ax25: convert ax25_uid_assoc.refcount 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/ax25.h  | 8 ++++----
 net/ax25/ax25_uid.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/net/ax25.h b/include/net/ax25.h
index e602f81..edd82f0 100644
--- a/include/net/ax25.h
+++ b/include/net/ax25.h
@@ -11,7 +11,7 @@
 #include <linux/timer.h>
 #include <linux/list.h>
 #include <linux/slab.h>
-#include <linux/atomic.h>
+#include <linux/refcount.h>
 #include <net/neighbour.h>
 #include <net/sock.h>
 
@@ -158,7 +158,7 @@ enum {
 
 typedef struct ax25_uid_assoc {
        struct hlist_node       uid_node;
-       atomic_t                refcount;
+       refcount_t              refcount;
        kuid_t                  uid;
        ax25_address            call;
 } ax25_uid_assoc;
@@ -167,11 +167,11 @@ typedef struct ax25_uid_assoc {
        hlist_for_each_entry(__ax25, list, uid_node)
 
 #define ax25_uid_hold(ax25) \
-       atomic_inc(&((ax25)->refcount))
+       refcount_inc(&((ax25)->refcount))
 
 static inline void ax25_uid_put(ax25_uid_assoc *assoc)
 {
-       if (atomic_dec_and_test(&assoc->refcount)) {
+       if (refcount_dec_and_test(&assoc->refcount)) {
                kfree(assoc);
        }
 }
diff --git a/net/ax25/ax25_uid.c b/net/ax25/ax25_uid.c
index 0403b0d..83b035f 100644
--- a/net/ax25/ax25_uid.c
+++ b/net/ax25/ax25_uid.c
@@ -107,7 +107,7 @@ int ax25_uid_ioctl(int cmd, struct sockaddr_ax25 *sax)
                if ((ax25_uid = kmalloc(sizeof(*ax25_uid), GFP_KERNEL)) == NULL)
                        return -ENOMEM;
 
-               atomic_set(&ax25_uid->refcount, 1);
+               refcount_set(&ax25_uid->refcount, 1);
                ax25_uid->uid  = sax25_kuid;
                ax25_uid->call = sax->sax25_call;
 
-- 
2.7.4