gianfar: simplify FCS handling and fix memory leak

commit d903ec77118c09f93a610b384d83a6df33a64fe6 upstream.

Previously, buffer descriptors containing only the frame check sequence
(FCS) were skipped and not added to the skb. However, the page reference
count was still incremented, leading to a memory leak.

Fixing this inside gfar_add_rx_frag() is difficult due to reserved
memory handling and page reuse. Instead, move the FCS handling to
gfar_process_frame() and trim off the FCS before passing the skb up the
networking stack.

Signed-off-by: Andy Spencer <aspencer@spacex.com>
Signed-off-by: Jim Gruen <jgruen@spacex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index c89a5a80c9c8b1f9db1962329979310e0e47f01e..1095c247357d9d44c4813280f05eab5e6acecaa9 100644 (file)
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -2936,29 +2936,17 @@ static bool gfar_add_rx_frag(struct gfar_rx_buff *rxb, u32 lstatus,
 {
        int size = lstatus & BD_LENGTH_MASK;
        struct page *page = rxb->page;
-       bool last = !!(lstatus & BD_LFLAG(RXBD_LAST));
-
-       /* Remove the FCS from the packet length */
-       if (last)
-               size -= ETH_FCS_LEN;
 
        if (likely(first)) {
                skb_put(skb, size);
        } else {
                /* the last fragments' length contains the full frame length */
-               if (last)
+               if (lstatus & BD_LFLAG(RXBD_LAST))
                        size -= skb->len;
 
-               /* Add the last fragment if it contains something other than
-                * the FCS, otherwise drop it and trim off any part of the FCS
-                * that was already received.
-                */
-               if (size > 0)
-                       skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
-                                       rxb->page_offset + RXBUF_ALIGNMENT,
-                                       size, GFAR_RXB_TRUESIZE);
-               else if (size < 0)
-                       pskb_trim(skb, skb->len + size);
+               skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
+                               rxb->page_offset + RXBUF_ALIGNMENT,
+                               size, GFAR_RXB_TRUESIZE);
        }
 
        /* try reuse page */
@@ -3071,6 +3059,9 @@ static void gfar_process_frame(struct net_device *ndev, struct sk_buff *skb)
        if (priv->padding)
                skb_pull(skb, priv->padding);
 
+       /* Trim off the FCS */
+       pskb_trim(skb, skb->len - ETH_FCS_LEN);
+
        if (ndev->features & NETIF_F_RXCSUM)
                gfar_rx_checksum(skb, fcb);