net: moxa: continue loop on skb allocation failure

If netdev_alloc_skb_ip_align() fails, subsequent code will
try to dereference an invalid pointer.

Continue to next descriptor on error.

While we're at it,

1. eliminate the chance of an endless loop, replace the main
   loop with while(rx < budget)

2. use napi_complete() and remove the explicit napi_gro_flush()

Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c
index 983d019497957b584d19eca181d350be97e7f09f..2f12c88c66abfa1cd0bb0e099e4a33a761327fd6 100644 (file)
--- a/drivers/net/ethernet/moxa/moxart_ether.c
+++ b/drivers/net/ethernet/moxa/moxart_ether.c
@@ -206,7 +206,7 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
        int rx_head = priv->rx_head;
        int rx = 0;
 
-       while (1) {
+       while (rx < budget) {
                desc = priv->rx_desc_base + (RX_REG_DESC_SIZE * rx_head);
                desc0 = readl(desc + RX_REG_OFFSET_DESC0);
 
@@ -218,7 +218,7 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
                        net_dbg_ratelimited("packet error\n");
                        priv->stats.rx_dropped++;
                        priv->stats.rx_errors++;
-                       continue;
+                       goto rx_next;
                }
 
                len = desc0 & RX_DESC0_FRAME_LEN_MASK;
@@ -235,6 +235,7 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
                        net_dbg_ratelimited("netdev_alloc_skb_ip_align failed\n");
                        priv->stats.rx_dropped++;
                        priv->stats.rx_errors++;
+                       goto rx_next;
                }
 
                memcpy(skb->data, priv->rx_buf[rx_head], len);
@@ -249,18 +250,15 @@ static int moxart_rx_poll(struct napi_struct *napi, int budget)
                if (desc0 & RX_DESC0_MULTICAST)
                        priv->stats.multicast++;
 
+rx_next:
                writel(RX_DESC0_DMA_OWN, desc + RX_REG_OFFSET_DESC0);
 
                rx_head = RX_NEXT(rx_head);
                priv->rx_head = rx_head;
-
-               if (rx >= budget)
-                       break;
        }
 
        if (rx < budget) {
-               napi_gro_flush(napi, false);
-               __napi_complete(napi);
+               napi_complete(napi);
        }
 
        priv->reg_imr |= RPKT_FINISH_M;