l2tp: fix l2tp_udp_recv_core()
pskb_may_pull() can change skb->data, so we have to load ptr/optr at the
right place.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index bf8d50c..cf0f308 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -756,9 +756,6 @@
goto error;
}
- /* Point to L2TP header */
- optr = ptr = skb->data;
-
/* Trace packet contents, if enabled */
if (tunnel->debug & L2TP_MSG_DATA) {
length = min(32u, skb->len);
@@ -769,12 +766,15 @@
offset = 0;
do {
- printk(" %02X", ptr[offset]);
+ printk(" %02X", skb->data[offset]);
} while (++offset < length);
printk("\n");
}
+ /* Point to L2TP header */
+ optr = ptr = skb->data;
+
/* Get L2TP header flags */
hdrflags = ntohs(*(__be16 *) ptr);