fix to file descriptor leak at MibBuilder

1 files changed, 4 insertions, 1 deletions

diff --git a/pysnmp/smi/builder.py b/pysnmp/smi/builder.py
index 214d723..5840b08 100644
--- a/pysnmp/smi/builder.py
+++ b/pysnmp/smi/builder.py
@@ -162,7 +162,10 @@ class DirMibSource(__AbstractMibSource):
     def _getData(self, f, mode):
         try:
             if f in os.listdir(self._srcName): # make FS case-sensitive
-                return open(os.path.join(self._srcName, f), mode).read()
+                fp = open(os.path.join(self._srcName, f), mode)
+                data = fp.read()
+                fp.close()
+                return data
         except OSError:
             pass
         raise IOError  # pretend there's no such file