Boundry check.

diff --git a/ext/standard/file.c b/ext/standard/file.c
index 939b5658347b25a948fc5b00e1123a8d2dc6c98e..ec53d34e774fc1f43989e04c2b620a87f2eae559 100644 (file)
--- a/ext/standard/file.c
+++ b/ext/standard/file.c
@@ -2340,7 +2340,7 @@ enclosure:
                                goto enclosure;
                        }
                } else {
-                       while (e < re && *(e - 1) == enclosure) {
+                       while (e < re && e > s && *(e - 1) == enclosure) {
                                e--;
                        }