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| author | Reshetova, Elena <elena.reshetova@intel.com> | 2017-07-04 09:34:59 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-04 01:29:04 -0700 |
| commit | d12f3827e04b58f617c43f4d44ad3ad788d852b7 (patch) | |
| tree | a001e2e73cb27476e2998a95dc0200f3443ba1ba /net/ipv6/xfrm6_tunnel.c | |
| parent | affa78bc6a204fac1b5ced4f34376f53c70ec0ac (diff) | |
| download | linux-d12f3827e04b58f617c43f4d44ad3ad788d852b7.tar.gz linux-d12f3827e04b58f617c43f4d44ad3ad788d852b7.tar.bz2 linux-d12f3827e04b58f617c43f4d44ad3ad788d852b7.zip | |
net, ipv6: convert xfrm6_tunnel_spi.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 'net/ipv6/xfrm6_tunnel.c')
| -rw-r--r-- | net/ipv6/xfrm6_tunnel.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c index d7b731a78d09..4e438bc7ee87 100644 --- a/net/ipv6/xfrm6_tunnel.c +++ b/net/ipv6/xfrm6_tunnel.c @@ -59,7 +59,7 @@ struct xfrm6_tunnel_spi { struct hlist_node list_byspi; xfrm_address_t addr; u32 spi; - atomic_t refcnt; + refcount_t refcnt; struct rcu_head rcu_head; }; @@ -160,7 +160,7 @@ alloc_spi: memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr)); x6spi->spi = spi; - atomic_set(&x6spi->refcnt, 1); + refcount_set(&x6spi->refcnt, 1); hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]); @@ -178,7 +178,7 @@ __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr) spin_lock_bh(&xfrm6_tunnel_spi_lock); x6spi = __xfrm6_tunnel_spi_lookup(net, saddr); if (x6spi) { - atomic_inc(&x6spi->refcnt); + refcount_inc(&x6spi->refcnt); spi = x6spi->spi; } else spi = __xfrm6_tunnel_alloc_spi(net, saddr); @@ -207,7 +207,7 @@ static void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr) list_byaddr) { if (xfrm6_addr_equal(&x6spi->addr, saddr)) { - if (atomic_dec_and_test(&x6spi->refcnt)) { + if (refcount_dec_and_test(&x6spi->refcnt)) { hlist_del_rcu(&x6spi->list_byaddr); hlist_del_rcu(&x6spi->list_byspi); call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu); |