updated for version 7.0-168
diff --git a/src/memline.c b/src/memline.c
index 80a870a..ddaf6de 100644
--- a/src/memline.c
+++ b/src/memline.c
@@ -1329,6 +1329,7 @@
 	    mf_put(mfp, hp, FALSE, FALSE);
 	mf_close(mfp, FALSE);	    /* will also vim_free(mfp->mf_fname) */
     }
+    vim_free(buf->b_ml.ml_stack);
     vim_free(buf);
     if (serious_error && called_from_main)
 	ml_close(curbuf, TRUE);
diff --git a/src/version.c b/src/version.c
index 550137e..f1095b6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -667,6 +667,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    168,
+/**/
     167,
 /**/
     166,
diff --git a/src/window.c b/src/window.c
index 5f5bb2a..ee9ef9c 100644
--- a/src/window.c
+++ b/src/window.c
@@ -4273,7 +4273,7 @@
     win_T	*wp;
 {
     wp->w_lines_valid = 0;
-    wp->w_lines = (wline_T *)alloc((unsigned)(Rows * sizeof(wline_T)));
+    wp->w_lines = (wline_T *)alloc_clear((unsigned)(Rows * sizeof(wline_T)));
     if (wp->w_lines == NULL)
 	return FAIL;
     return OK;