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authorReshetova, Elena <elena.reshetova@intel.com>2017-07-04 15:53:10 +0300
committerDavid S. Miller <davem@davemloft.net>2017-07-04 22:35:17 +0100
commit16f73c964956e0f78669f1681191093dd030c9ee (patch)
tree69006e3034abb570b6d8edda51ae3523b40f77ed
parentd25189ca8665e3ed493c7bc0607e62c2fcb314ad (diff)
downloadlinux-16f73c964956e0f78669f1681191093dd030c9ee.tar.bz2
net, ipx: convert ipx_route.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>
-rw-r--r--include/net/ipx.h6
-rw-r--r--net/ipx/ipx_route.c2
2 files changed, 4 insertions, 4 deletions
diff --git a/include/net/ipx.h b/include/net/ipx.h
index 2de12814ab81..af32b97b5ddd 100644
--- a/include/net/ipx.h
+++ b/include/net/ipx.h
@@ -81,7 +81,7 @@ struct ipx_route {
unsigned char ir_routed;
unsigned char ir_router_node[IPX_NODE_LEN];
struct list_head node; /* node in ipx_routes list */
- atomic_t refcnt;
+ refcount_t refcnt;
};
struct ipx_cb {
@@ -164,12 +164,12 @@ static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
static __inline__ void ipxrtr_hold(struct ipx_route *rt)
{
- atomic_inc(&rt->refcnt);
+ refcount_inc(&rt->refcnt);
}
static __inline__ void ipxrtr_put(struct ipx_route *rt)
{
- if (atomic_dec_and_test(&rt->refcnt))
+ if (refcount_dec_and_test(&rt->refcnt))
kfree(rt);
}
#endif /* _NET_INET_IPX_H_ */
diff --git a/net/ipx/ipx_route.c b/net/ipx/ipx_route.c
index 3e2a32a9f3bd..b5d91447f3dc 100644
--- a/net/ipx/ipx_route.c
+++ b/net/ipx/ipx_route.c
@@ -59,7 +59,7 @@ int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
if (!rt)
goto out;
- atomic_set(&rt->refcnt, 1);
+ refcount_set(&rt->refcnt, 1);
ipxrtr_hold(rt);
write_lock_bh(&ipx_routes_lock);
list_add(&rt->node, &ipx_routes);