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net: convert netpoll_info.refcnt from atomic_t to refcount_t

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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>
This commit is contained in:
Reshetova, Elena
2017-06-30 13:08:04 +03:00
committed by David S. Miller
parent 7658b36f1b
commit 433cea4d9b
2 changed files with 5 additions and 4 deletions
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3
include/linux/netpoll.h
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@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/refcount.h>
union inet_addr {
__u32 all[4];
@@ -34,7 +35,7 @@ struct netpoll {
};
struct netpoll_info {
atomic_t refcnt;
refcount_t refcnt;
struct semaphore dev_lock;