ctlsock: sanitize: handle multiple leading slashes

internal/ctlsock/sanitize.go

@@ -6,23 +6,25 @@ import (
 )
 
 // SanitizePath adapts filepath.Clean for FUSE paths.
-// 1) A leading slash is dropped
+// 1) Leading slash(es) are dropped
 // 2) It returns "" instead of "."
 // 3) If the cleaned path points above CWD (start with ".."), an empty string
 //    is returned
 // See the TestSanitizePath testcases for examples.
 func SanitizePath(path string) string {
+	// (1)
+	for len(path) > 0 && path[0] == '/' {
+		path = path[1:]
+	}
 	if len(path) == 0 {
 		return ""
 	}
-	// Drop leading slash
-	if path[0] == '/' {
-		path = path[1:]
-	}
 	clean := filepath.Clean(path)
+	// (2)
 	if clean == "." {
 		return ""
 	}
+	// (3)
 	if clean == ".." || strings.HasPrefix(clean, "../") {
 		return ""
 	}

internal/ctlsock/sanitize_test.go

@@ -19,6 +19,7 @@ func TestSanitizePath(t *testing.T) {
 		{"foo/../..", ""},
 		{"foo/../../aaaaaa", ""},
 		{"/foo/../../aaaaaa", ""},
+		{"/////", ""},
 	}
 	for _, tc := range testCases {
 		res := SanitizePath(tc[0])