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-rw-r--r--net/ipv4/route.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index cd76b3cb709..65b3a8b11a6 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1085,8 +1085,16 @@ restart:
now = jiffies;
if (!rt_caching(dev_net(rt->u.dst.dev))) {
- rt_drop(rt);
- return 0;
+ /*
+ * If we're not caching, just tell the caller we
+ * were successful and don't touch the route. The
+ * caller hold the sole reference to the cache entry, and
+ * it will be released when the caller is done with it.
+ * If we drop it here, the callers have no way to resolve routes
+ * when we're not caching. Instead, just point *rp at rt, so
+ * the caller gets a single use out of the route
+ */
+ goto report_and_exit;
}
rthp = &rt_hash_table[hash].chain;
@@ -1217,6 +1225,8 @@ restart:
rcu_assign_pointer(rt_hash_table[hash].chain, rt);
spin_unlock_bh(rt_hash_lock_addr(hash));
+
+report_and_exit:
if (rp)
*rp = rt;
else