diff -r a2c2dd399f3b -r b6ed2505d6cf mercurial/mpatch.c
--- a/mercurial/mpatch.c	Fri Mar 25 10:47:49 2016 -0700
+++ b/mercurial/mpatch.c	Wed Mar 16 17:29:29 2016 -0700
@@ -205,7 +205,7 @@
 	int pos = 0;
 
 	/* assume worst case size, we won't have many of these lists */
-	l = lalloc(len / 12);
+	l = lalloc(len / 12 + 1);
 	if (!l)
 		return NULL;