diff options
| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 09:34:54 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 01:29:03 -0700 |
| commit | 0aeea21ada517b99a6e95298ffc105381bcd3a52 (patch) | |
| tree | 5a09b35a770e6893d3f146053463a64ddce6488b /include/net/ipv6.h | |
| parent | 25f4535a94c2b38d09912d7e8bab371c9e97be38 (diff) | |
net, ipv6: convert ipv6_txoptions.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: 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>
Diffstat (limited to 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 3e505bbff8ca..6eac5cf8f1e6 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -16,6 +16,7 @@ #include <linux/ipv6.h> #include <linux/hardirq.h> #include <linux/jhash.h> +#include <linux/refcount.h> #include <net/if_inet6.h> #include <net/ndisc.h> #include <net/flow.h> @@ -203,7 +204,7 @@ extern rwlock_t ip6_ra_lock; */ struct ipv6_txoptions { - atomic_t refcnt; + refcount_t refcnt; /* Length of this structure */ int tot_len; @@ -265,7 +266,7 @@ static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) rcu_read_lock(); opt = rcu_dereference(np->opt); if (opt) { - if (!atomic_inc_not_zero(&opt->refcnt)) + if (!refcount_inc_not_zero(&opt->refcnt)) opt = NULL; else opt = rcu_pointer_handoff(opt); @@ -276,7 +277,7 @@ static inline struct ipv6_txoptions *txopt_get(const struct ipv6_pinfo *np) static inline void txopt_put(struct ipv6_txoptions *opt) { - if (opt && atomic_dec_and_test(&opt->refcnt)) + if (opt && refcount_dec_and_test(&opt->refcnt)) kfree_rcu(opt, rcu); } |