vmxnet3: Fix memory leaks in rx path (fwd)

If rcd length was zero, the page used for frag was not being released. It
was being replaced with a newly allocated page. This change takes care
of that memory leak.
Signed-off-by: Guolin Yang <gyang@vmware.com>
Signed-off-by: Shreyas N Bhatewara <sbhatewara@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/vmxnet3/vmxnet3_drv.c

@@ -861,6 +861,9 @@ vmxnet3_parse_and_copy_hdr(struct sk_buff *skb, struct vmxnet3_tx_queue *tq,
 					     , skb_headlen(skb));
 		}
 
+		if (skb->len <= VMXNET3_HDR_COPY_SIZE)
+			ctx->copy_size = skb->len;
+
 		/* make sure headers are accessible directly */
 		if (unlikely(!pskb_may_pull(skb, ctx->copy_size)))
 			goto err;
@@ -1273,13 +1276,14 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
 			if (skip_page_frags)
 				goto rcd_done;
 
+			if (rcd->len) {
 				new_page = alloc_page(GFP_ATOMIC);
-			if (unlikely(new_page == NULL)) {
 				/* Replacement page frag could not be allocated.
 				 * Reuse this page. Drop the pkt and free the
 				 * skb which contained this page as a frag. Skip
 				 * processing all the following non-sop frags.
 				 */
+				if (unlikely(!new_page)) {
 					rq->stats.rx_buf_alloc_failure++;
 					dev_kfree_skb(ctx->skb);
 					ctx->skb = NULL;
@@ -1287,23 +1291,22 @@ vmxnet3_rq_rx_complete(struct vmxnet3_rx_queue *rq,
 					goto rcd_done;
 				}
 
-			if (rcd->len) {
 				dma_unmap_page(&adapter->pdev->dev,
 					       rbi->dma_addr, rbi->len,
 					       PCI_DMA_FROMDEVICE);
 
 				vmxnet3_append_frag(ctx->skb, rcd, rbi);
-			}
 
 				/* Immediate refill */
 				rbi->page = new_page;
-			rbi->dma_addr = dma_map_page(&adapter->pdev->dev,
-						     rbi->page,
+				rbi->dma_addr = dma_map_page(&adapter->pdev->dev
+							, rbi->page,
 							0, PAGE_SIZE,
 							PCI_DMA_FROMDEVICE);
 				rxd->addr = cpu_to_le64(rbi->dma_addr);
 				rxd->len = rbi->len;
 			}
+		}
 
 
 		skb = ctx->skb;