[Xen-changelog] [linux-2.6.18-xen] netback: fix off by one determining when to copy a RX skb

[Xen patchbot-linux-2.6.18-xen <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1441785095 -7200
# Node ID 36fb301948766f3ac9efbf87f16595d50dbc41b9
# Parent  9c891c830cddb69cca1cf6e908cafdfaa5e895af
netback: fix off by one determining when to copy a RX skb

Copying is needed only when page offset plus length of head exceeds
PAGE_SIZE, not when their sum equals it.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---


diff -r 9c891c830cdd -r 36fb30194876 drivers/xen/netback/netback.c
--- a/drivers/xen/netback/netback.c     Wed Sep 09 09:49:03 2015 +0200
+++ b/drivers/xen/netback/netback.c     Wed Sep 09 09:51:35 2015 +0200
@@ -309,7 +309,7 @@ int netif_be_start_xmit(struct sk_buff *
         * boundary, because netbk_gop_skb can't handle them.
         */
        if (!netif->copying_receiver ||
-           ((skb_headlen(skb) + offset_in_page(skb->data)) >= PAGE_SIZE)) {
+           ((offset_in_page(skb->data) + skb_headlen(skb)) > PAGE_SIZE)) {
                struct sk_buff *nskb = netbk_copy_skb(skb);
                if ( unlikely(nskb == NULL) )
                        goto drop;

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