Commit 7658b36f authored by Reshetova, Elena's avatar Reshetova, Elena Committed by David S. Miller

net: convert in_device.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: default avatarElena Reshetova <elena.reshetova@intel.com>
Signed-off-by: default avatarHans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarDavid Windsor <dwindsor@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8851ab52
......@@ -11,6 +11,7 @@
#include <linux/timer.h>
#include <linux/sysctl.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
struct ipv4_devconf {
void *sysctl;
......@@ -22,7 +23,7 @@ struct ipv4_devconf {
struct in_device {
struct net_device *dev;
atomic_t refcnt;
refcount_t refcnt;
int dead;
struct in_ifaddr *ifa_list; /* IP ifaddr chain */
......@@ -219,7 +220,7 @@ static inline struct in_device *in_dev_get(const struct net_device *dev)
rcu_read_lock();
in_dev = __in_dev_get_rcu(dev);
if (in_dev)
atomic_inc(&in_dev->refcnt);
refcount_inc(&in_dev->refcnt);
rcu_read_unlock();
return in_dev;
}
......@@ -240,12 +241,12 @@ void in_dev_finish_destroy(struct in_device *idev);
static inline void in_dev_put(struct in_device *idev)
{
if (atomic_dec_and_test(&idev->refcnt))
if (refcount_dec_and_test(&idev->refcnt))
in_dev_finish_destroy(idev);
}
#define __in_dev_put(idev) atomic_dec(&(idev)->refcnt)
#define in_dev_hold(idev) atomic_inc(&(idev)->refcnt)
#define __in_dev_put(idev) refcount_dec(&(idev)->refcnt)
#define in_dev_hold(idev) refcount_inc(&(idev)->refcnt)
#endif /* __KERNEL__ */
......
......@@ -252,7 +252,7 @@ static struct in_device *inetdev_init(struct net_device *dev)
/* Reference in_dev->dev */
dev_hold(dev);
/* Account for reference dev->ip_ptr (below) */
in_dev_hold(in_dev);
refcount_set(&in_dev->refcnt, 1);
err = devinet_sysctl_register(in_dev);
if (err) {
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment