Handle nil os.FileInfo in filepath.Walk

closes #2466

CHANGELOG.md

@@ -66,6 +66,7 @@ be deprecated eventually.
 - [#2380](https://github.com/influxdata/telegraf/issues/2380): buffer_size field value is negative number from "internal" plugin.
 - [#2414](https://github.com/influxdata/telegraf/issues/2414): Missing error handling in the MySQL plugin leads to segmentation violation.
 - [#2178](https://github.com/influxdata/telegraf/issues/2178): logparser: regexp with lookahead.
+- [#2466](https://github.com/influxdata/telegraf/issues/2466): Telegraf can crash in LoadDirectory on 0600 files.
 
 ## v1.2.1 [2017-02-01]
 

internal/config/config.go

@@ -505,6 +505,10 @@ func PrintOutputConfig(name string) error {
 
 func (c *Config) LoadDirectory(path string) error {
 	walkfn := func(thispath string, info os.FileInfo, _ error) error {
+		if info == nil {
+			log.Printf("W! Telegraf is not permitted to read %s", thispath)
+			return nil
+		}
 		if info.IsDir() {
 			return nil
 		}