diff --git a/[refs] b/[refs]
index 3d3d8570fff4..31d03e5a8a44 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2446304dd687488c054d0437f2aeef1ef2bfbd02
+refs/heads/master: 56a8c8b6ac4d6edba5153d17730aaf96ba8f1f8c
diff --git a/trunk/drivers/infiniband/hw/mlx4/srq.c b/trunk/drivers/infiniband/hw/mlx4/srq.c
index 42ab4a801d6a..12fac1c8989d 100644
--- a/trunk/drivers/infiniband/hw/mlx4/srq.c
+++ b/trunk/drivers/infiniband/hw/mlx4/srq.c
@@ -297,6 +297,12 @@ int mlx4_ib_post_srq_recv(struct ib_srq *ibsrq, struct ib_recv_wr *wr,
 			break;
 		}
 
+		if (unlikely(srq->head == srq->tail)) {
+			err = -ENOMEM;
+			*bad_wr = wr;
+			break;
+		}
+
 		srq->wrid[srq->head] = wr->wr_id;
 
 		next      = get_wqe(srq, srq->head);