[ 054/218] staging: r8712u: fix bug in r8712_recv_indicatepkt()

[Greg Kroah-Hartman]

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

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

From: Eric Dumazet <edumazet@xxxxxxxxxx>

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 <edumazet@xxxxxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxx>
Acked-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/staging/rtl8712/recv_linux.c |    7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/staging/rtl8712/recv_linux.c
+++ b/drivers/staging/rtl8712/recv_linux.c
@@ -117,13 +117,8 @@ void r8712_recv_indicatepkt(struct _adap
 	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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