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net: convert ip_mc_list.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 13:08:02 +03:00 • committed by David S. Miller
parent 41c6d650f6
commit 8851ab5267
2 changed files with 7 additions and 6 deletions
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3
include/linux/igmp.h
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@ -18,6 +18,7 @@
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <linux/refcount.h>
#include <uapi/linux/igmp.h>
static inline struct igmphdr *igmp_hdr(const struct sk_buff *skb)
@ -84,7 +85,7 @@ struct ip_mc_list {
struct ip_mc_list __rcu *next_hash;
struct timer_list timer;
int users;
atomic_t refcnt;
refcount_t refcnt;
spinlock_t lock;
char tm_running;
char reporter;