RDMA/cxgb4: Fix possible memory leak in RX_PKT processing

If cxgb4_ofld_send() returns < 0, then send_fw_pass_open_req() must
free the request skb and the saved skb with the tcp header.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/cxgb4/cm.c

@@ -3204,6 +3204,7 @@ static void send_fw_pass_open_req(struct c4iw_dev *dev, struct sk_buff *skb,
 	struct sk_buff *req_skb;
 	struct fw_ofld_connection_wr *req;
 	struct cpl_pass_accept_req *cpl = cplhdr(skb);
+	int ret;
 
 	req_skb = alloc_skb(sizeof(struct fw_ofld_connection_wr), GFP_KERNEL);
 	req = (struct fw_ofld_connection_wr *)__skb_put(req_skb, sizeof(*req));
@@ -3240,7 +3241,13 @@ static void send_fw_pass_open_req(struct c4iw_dev *dev, struct sk_buff *skb,
 	req->cookie = (unsigned long)skb;
 
 	set_wr_txq(req_skb, CPL_PRIORITY_CONTROL, port_id);
-	cxgb4_ofld_send(dev->rdev.lldi.ports[0], req_skb);
+	ret = cxgb4_ofld_send(dev->rdev.lldi.ports[0], req_skb);
+	if (ret < 0) {
+		pr_err("%s - cxgb4_ofld_send error %d - dropping\n", __func__,
+		       ret);
+		kfree_skb(skb);
+		kfree_skb(req_skb);
+	}
 }
 
 /*