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authorReshetova, Elena <elena.reshetova@intel.com>2017-06-30 13:07:57 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-01 07:39:07 -0700
commit53869cebce4bc53f71a080e7830600d4ae1ab712 (patch)
treec99b8ea34f0b909e5db784b7426e1afcb21aeabf /net/bridge
parent6343944bc1050dcec7c959f484ee0fb6928db3be (diff)
downloadlinux-53869cebce4bc53f71a080e7830600d4ae1ab712.tar.bz2
net: convert nf_bridge_info.use 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/bridge')
-rw-r--r--net/bridge/br_netfilter_hooks.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bridge/br_netfilter_hooks.c b/net/bridge/br_netfilter_hooks.c
index 067cf0313449..2261e5194c82 100644
--- a/net/bridge/br_netfilter_hooks.c
+++ b/net/bridge/br_netfilter_hooks.c
@@ -149,12 +149,12 @@ static inline struct nf_bridge_info *nf_bridge_unshare(struct sk_buff *skb)
{
struct nf_bridge_info *nf_bridge = skb->nf_bridge;
- if (atomic_read(&nf_bridge->use) > 1) {
+ if (refcount_read(&nf_bridge->use) > 1) {
struct nf_bridge_info *tmp = nf_bridge_alloc(skb);
if (tmp) {
memcpy(tmp, nf_bridge, sizeof(struct nf_bridge_info));
- atomic_set(&tmp->use, 1);
+ refcount_set(&tmp->use, 1);
}
nf_bridge_put(nf_bridge);
nf_bridge = tmp;