[PATCH 3/9] net, ipv6: convert inet6_ifaddr.refcnt from atomic_t to refcount_t
From: Elena Reshetova <elena.reshetova@intel.com>
Date: 2017-03-16 18:27:13
Also in:
lkml
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
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 <redacted> Signed-off-by: Kees Cook <redacted> Signed-off-by: David Windsor <redacted> --- include/net/addrconf.h | 6 +++--- include/net/if_inet6.h | 2 +- net/ipv6/addrconf.c | 2 +- 3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index e5704b9..7b2fdd4 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h@@ -326,18 +326,18 @@ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); static inline void in6_ifa_put(struct inet6_ifaddr *ifp) { - if (atomic_dec_and_test(&ifp->refcnt)) + if (refcount_dec_and_test(&ifp->refcnt)) inet6_ifa_finish_destroy(ifp); } static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) { - atomic_dec(&ifp->refcnt); + refcount_dec(&ifp->refcnt); } static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) { - atomic_inc(&ifp->refcnt); + refcount_inc(&ifp->refcnt); }
diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h
index e7a17b2..2b41cb8 100644
--- a/include/net/if_inet6.h
+++ b/include/net/if_inet6.h@@ -46,7 +46,7 @@ struct inet6_ifaddr { /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */ __u32 valid_lft; __u32 prefered_lft; - atomic_t refcnt; + refcount_t refcnt; spinlock_t lock; int state;
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a2ce7666..94f45dc 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c@@ -1011,7 +1011,7 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, ifa->idev = idev; in6_dev_hold(idev); /* For caller */ - in6_ifa_hold(ifa); + refcount_set(&ifa->refcnt, 1); /* Add to big hash table */ hash = inet6_addr_hash(addr);
--
2.7.4