diff --git a/[refs] b/[refs]
index f4090b70b8b4..06415d7504a3 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a1b08e75dff3dc18a88444803753e667bb1d126e
+refs/heads/master: 8379e7c46cc48f51197dd663fc6676f47f2a1e71
diff --git a/trunk/fs/ocfs2/aops.c b/trunk/fs/ocfs2/aops.c
index b401654011a2..8a1e61545f41 100644
--- a/trunk/fs/ocfs2/aops.c
+++ b/trunk/fs/ocfs2/aops.c
@@ -1747,8 +1747,8 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
 	 * we know zeros will only be needed in the first and/or last cluster.
 	 */
 	if (clusters_to_alloc || extents_to_split ||
-	    wc->w_desc[0].c_needs_zero ||
-	    wc->w_desc[wc->w_clen - 1].c_needs_zero)
+	    (wc->w_clen && (wc->w_desc[0].c_needs_zero ||
+			    wc->w_desc[wc->w_clen - 1].c_needs_zero)))
 		cluster_of_pages = 1;
 	else
 		cluster_of_pages = 0;