l2tp: copy 4 more bytes to linear part if necessary

The size of L2TPv2 header with all optional fields is 14 bytes.
l2tp_udp_recv_core only moves 10 bytes to the linear part of a
skb. This may lead to l2tp_recv_common read data outside of a skb.

This patch make sure that there is at least 14 bytes in the linear
part of a skb to meet the maximum need of l2tp_udp_recv_core and
l2tp_recv_common. The minimum size of both PPP HDLC-like frame and
Ethernet frame is larger than 14 bytes, so we are safe to do so.

Also remove L2TP_HDR_SIZE_NOSEQ, it is unused now.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Jacob Wen <jian.w.wen@oracle.com>
Acked-by: Guillaume Nault <gnault@redhat.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 dd5ba0c..fed6bec 100644 (file)
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -83,8 +83,7 @@
 #define L2TP_SLFLAG_S     0x40000000
 #define L2TP_SL_SEQ_MASK   0x00ffffff
 
-#define L2TP_HDR_SIZE_SEQ              10
-#define L2TP_HDR_SIZE_NOSEQ            6
+#define L2TP_HDR_SIZE_MAX              14
 
 /* Default trace flags */
 #define L2TP_DEFAULT_DEBUG_FLAGS       0
@@ -808,7 +807,7 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb)
        __skb_pull(skb, sizeof(struct udphdr));
 
        /* Short packet? */
-       if (!pskb_may_pull(skb, L2TP_HDR_SIZE_SEQ)) {
+       if (!pskb_may_pull(skb, L2TP_HDR_SIZE_MAX)) {
                l2tp_info(tunnel, L2TP_MSG_DATA,
                          "%s: recv short packet (len=%d)\n",
                          tunnel->name, skb->len);