fs: Filter out valid paths and volnames. (#1321)

fs-dir-common.go

@@ -134,7 +134,7 @@ func treeWalk(bucketDir, prefixDir, entryPrefixMatch, marker string, recursive b
 			hasReserved := hasReservedPrefix(dirent.name) || hasReservedSuffix(dirent.name)
 			// All dirents which match prefix and do not have reserved
 			// keywords in them are valid entries.
-			return strings.HasPrefix(dirent.name, entryPrefixMatch) && !hasReserved
+			return strings.HasPrefix(dirent.name, entryPrefixMatch) && !hasReserved && isValidPath(dirent.name)
 		}
 		return false
 	}

fs-utils.go

@@ -60,7 +60,7 @@ func isValidPath(path string) bool {
 // isValidPrefix verifies where the prefix is a valid path.
 func isValidPrefix(prefix string) bool {
 	// Prefix can be empty.
-	if prefix == "" {
+	if prefix == "" || prefix == "/" {
 		return true
 	}
 	// Verify if prefix is a valid path.

fs.go

@@ -143,7 +143,7 @@ func removeDuplicateVols(vols []VolInfo) []VolInfo {
 func getAllUniqueVols(dirPath string) ([]VolInfo, error) {
 	volumeFn := func(dirent fsDirent) bool {
 		// Return all directories.
-		return dirent.IsDir()
+		return dirent.IsDir() && isValidVolname(dirent.name)
 	}
 	namesOnly := false // Returned dirent names are absolute.
 	dirents, err := scandir(dirPath, volumeFn, namesOnly)