ipv4: make sure nh_pcpu_rth_output is always allocated

Avoid checking nh_pcpu_rth_output in fast path,
abort fib_info creation on alloc_percpu failure.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 3 deletions

diff --git a/net/ipv4/fib_semantics.c b/net/ipv4/fib_semantics.c
index 267753060ff..71b125cd5db 100644
--- a/net/ipv4/fib_semantics.c
+++ b/net/ipv4/fib_semantics.c
@@ -840,6 +840,8 @@ struct fib_info *fib_create_info(struct fib_config *cfg)
         change_nexthops(fi) {
                 nexthop_nh->nh_parent = fi;
                 nexthop_nh->nh_pcpu_rth_output = alloc_percpu(struct rtable __rcu *);
+                if (!nexthop_nh->nh_pcpu_rth_output)
+                        goto failure;
         } endfor_nexthops(fi)
 
         if (cfg->fc_mx) {
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index b90da1bc270..5b0180f11b2 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1207,8 +1207,6 @@ static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt)
         if (rt_is_input_route(rt)) {
                 p = (struct rtable **)&nh->nh_rth_input;
         } else {
-                if (!nh->nh_pcpu_rth_output)
-                        goto nocache;
                 p = (struct rtable **)__this_cpu_ptr(nh->nh_pcpu_rth_output);
         }
         orig = *p;
@@ -1223,7 +1221,6 @@ static bool rt_cache_route(struct fib_nh *nh, struct rtable *rt)
                  * unsuccessful at storing this route into the cache
                  * we really need to set it.
                  */
-nocache:
                 rt->dst.flags |= DST_NOCACHE;
                 ret = false;
         }