diff options
| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 15:52:59 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 22:35:15 +0100 |
| commit | 66af846fe54b780f8f5bd9a62aee081bd2ace582 (patch) | |
| tree | d9b9f336bff0491e71d818ee6a3ccfbad9e35b23 /drivers | |
| parent | f00c854c965fd7197c9ac0f59d823ca0a909e33b (diff) | |
| download | linux-66af846fe54b780f8f5bd9a62aee081bd2ace582.tar.bz2 | |
net, vxlan: convert vxlan_sock.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 'drivers')
| -rw-r--r-- | drivers/net/vxlan.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index b04e103350fb..96aa7e6cf214 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -1034,11 +1034,11 @@ static bool vxlan_group_used(struct vxlan_net *vn, struct vxlan_dev *dev) /* The vxlan_sock is only used by dev, leaving group has * no effect on other vxlan devices. */ - if (family == AF_INET && sock4 && atomic_read(&sock4->refcnt) == 1) + if (family == AF_INET && sock4 && refcount_read(&sock4->refcnt) == 1) return false; #if IS_ENABLED(CONFIG_IPV6) sock6 = rtnl_dereference(dev->vn6_sock); - if (family == AF_INET6 && sock6 && atomic_read(&sock6->refcnt) == 1) + if (family == AF_INET6 && sock6 && refcount_read(&sock6->refcnt) == 1) return false; #endif @@ -1075,7 +1075,7 @@ static bool __vxlan_sock_release_prep(struct vxlan_sock *vs) if (!vs) return false; - if (!atomic_dec_and_test(&vs->refcnt)) + if (!refcount_dec_and_test(&vs->refcnt)) return false; vn = net_generic(sock_net(vs->sock->sk), vxlan_net_id); @@ -2825,7 +2825,7 @@ static struct vxlan_sock *vxlan_socket_create(struct net *net, bool ipv6, } vs->sock = sock; - atomic_set(&vs->refcnt, 1); + refcount_set(&vs->refcnt, 1); vs->flags = (flags & VXLAN_F_RCV_FLAGS); spin_lock(&vn->sock_lock); @@ -2860,7 +2860,7 @@ static int __vxlan_sock_add(struct vxlan_dev *vxlan, bool ipv6) spin_lock(&vn->sock_lock); vs = vxlan_find_sock(vxlan->net, ipv6 ? AF_INET6 : AF_INET, vxlan->cfg.dst_port, vxlan->cfg.flags); - if (vs && !atomic_add_unless(&vs->refcnt, 1, 0)) { + if (vs && !refcount_inc_not_zero(&vs->refcnt)) { spin_unlock(&vn->sock_lock); return -EBUSY; } |