diff --git a/fs/ntfs3/attrib.c b/fs/ntfs3/attrib.c
index 5d4ad0f4feb311931e7c748c0cd9b873b01918f4..2aa38ba39149567f6edeb12d38e3a0e9b6b79cf0 100644
--- a/fs/ntfs3/attrib.c
+++ b/fs/ntfs3/attrib.c
@@ -1662,13 +1662,15 @@ int attr_allocate_frame(struct ntfs_inode *ni, CLST frame, size_t compr_size,
 ok:
 	run_truncate_around(run, vcn);
 out:
-	if (new_valid > data_size)
-		new_valid = data_size;
+	if (attr_b) {
+		if (new_valid > data_size)
+			new_valid = data_size;
 
-	valid_size = le64_to_cpu(attr_b->nres.valid_size);
-	if (new_valid != valid_size) {
-		attr_b->nres.valid_size = cpu_to_le64(valid_size);
-		mi_b->dirty = true;
+		valid_size = le64_to_cpu(attr_b->nres.valid_size);
+		if (new_valid != valid_size) {
+			attr_b->nres.valid_size = cpu_to_le64(valid_size);
+			mi_b->dirty = true;
+		}
 	}
 
 	return err;