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net: convert fib_rule.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 13:08:06 +03:00
committed by David S. Miller
parent 8c9814b970
commit 717d1e993a
2 changed files with 6 additions and 5 deletions
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7
include/net/fib_rules.h
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@@ -5,6 +5,7 @@
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/fib_rules.h>
#include <linux/refcount.h>
#include <net/flow.h>
#include <net/rtnetlink.h>
@@ -29,7 +30,7 @@ struct fib_rule {
struct fib_rule __rcu *ctarget;
struct net *fr_net;
atomic_t refcnt;
refcount_t refcnt;
u32 pref;
int suppress_ifgroup;
int suppress_prefixlen;
@@ -103,12 +104,12 @@ struct fib_rules_ops {
static inline void fib_rule_get(struct fib_rule *rule)
{
atomic_inc(&rule->refcnt);
refcount_inc(&rule->refcnt);
}
static inline void fib_rule_put(struct fib_rule *rule)
{
if (atomic_dec_and_test(&rule->refcnt))
if (refcount_dec_and_test(&rule->refcnt))
kfree_rcu(rule, rcu);
}