3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <eduma...@google.com>

commit abf02cfc179bb4bd30d05f582d61b3b8f429b813 upstream.

64bit arches have a buggy r8712u driver, let's fix it.

skb->tail must be set properly or network stack behavior is undefined.

Addresses https://bugzilla.redhat.com/show_bug.cgi?id=847525
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=45071

Signed-off-by: Eric Dumazet <eduma...@google.com>
Cc: Dave Jones <da...@redhat.com>
Acked-by: Larry Finger <larry.fin...@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 drivers/staging/rtl8712/recv_linux.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/staging/rtl8712/recv_linux.c 
b/drivers/staging/rtl8712/recv_linux.c
index 0e26d5f..495ee12 100644
--- a/drivers/staging/rtl8712/recv_linux.c
+++ b/drivers/staging/rtl8712/recv_linux.c
@@ -117,13 +117,8 @@ void r8712_recv_indicatepkt(struct _adapter *padapter,
        if (skb == NULL)
                goto _recv_indicatepkt_drop;
        skb->data = precv_frame->u.hdr.rx_data;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->tail = (sk_buff_data_t)(precv_frame->u.hdr.rx_tail -
-                    precv_frame->u.hdr.rx_head);
-#else
-       skb->tail = (sk_buff_data_t)precv_frame->u.hdr.rx_tail;
-#endif
        skb->len = precv_frame->u.hdr.len;
+       skb_set_tail_pointer(skb, skb->len);
        if ((pattrib->tcpchk_valid == 1) && (pattrib->tcp_chkrpt == 1))
                skb->ip_summed = CHECKSUM_UNNECESSARY;
        else


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