config: Fix a potential deadlock in config reading

Note that the deadlock has not been seen earlier, in tests on in real Hugo sites.

Fixes #8791

diff --git a/config/defaultConfigProvider.go b/config/defaultConfigProvider.go
index 05c3b9126aafe880889b59a4eedf9030be492b35..2391ec85310dfacfdc72ea9e762b4b3337bbb8c2 100644 (file)
--- a/config/defaultConfigProvider.go
+++ b/config/defaultConfigProvider.go
@@ -89,6 +89,7 @@ func (c *defaultConfigProvider) Get(k string) interface{} {
        c.mu.RLock()
        key, m := c.getNestedKeyAndMap(strings.ToLower(k), false)
        if m == nil {
+               c.mu.RUnlock()
                return nil
        }
        v := m[key]