[PATCH] llc: fix skb size for test responses

[Jim Westfall <jwestfall@surrealistic.net>]

Hi

The llc test command is used for a layer2 ping and contains a variable 
length payload that we must include in the response.  Use the size of the 
received skb as the size of the skb we must allocate to hold the payload. 

This resolved an skb_over_panic(), when trying to copy the payload into 
what was a hard coded skb of size 128.

Signed-off-by: Jim Westfall <jwestfall@surrealistic.net>

diff -urp linux-2.6.24.2.org/net/llc/llc_s_ac.c linux-2.6.24.2/net/llc/llc_s_ac.c
--- linux-2.6.24.2.org/net/llc/llc_s_ac.c	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2/net/llc/llc_s_ac.c	2008-02-24 10:15:02.000000000 -0800
@@ -148,9 +148,18 @@ int llc_sap_action_send_test_r(struct ll
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_da(skb, mac_sa);
 	llc_pdu_decode_ssap(skb, &dsap);
-	nskb = llc_alloc_frame(NULL, skb->dev);
+	nskb = alloc_skb(skb->end - skb->head, GFP_ATOMIC);
+
 	if (!nskb)
 		goto out;
+
+	skb_reset_mac_header(nskb);
+	skb_reserve(nskb, 50);
+	skb_reset_network_header(nskb);
+	skb_reset_transport_header(nskb);
+	nskb->protocol = htons(ETH_P_802_2);
+	nskb->dev = skb->dev;
+
 	llc_pdu_header_init(nskb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap,
 			    LLC_PDU_RSP);
 	llc_pdu_init_as_test_rsp(nskb, skb);
diff -urp linux-2.6.24.2.org/net/llc/llc_station.c linux-2.6.24.2/net/llc/llc_station.c
--- linux-2.6.24.2.org/net/llc/llc_station.c	2008-02-10 21:51:11.000000000 -0800
+++ linux-2.6.24.2/net/llc/llc_station.c	2008-02-24 10:10:01.000000000 -0800
@@ -298,10 +298,18 @@ static int llc_station_ac_send_test_r(st
 {
 	u8 mac_da[ETH_ALEN], dsap;
 	int rc = 1;
-	struct sk_buff *nskb = llc_alloc_frame(NULL, skb->dev);
+	struct sk_buff *nskb = alloc_skb(skb->end - skb->head, GFP_ATOMIC);
 
 	if (!nskb)
 		goto out;
+
+	skb_reset_mac_header(nskb);
+	skb_reserve(nskb, 50);
+	skb_reset_network_header(nskb);
+	skb_reset_transport_header(nskb);
+	nskb->protocol = htons(ETH_P_802_2);
+	nskb->dev = skb->dev;
+
 	rc = 0;
 	llc_pdu_decode_sa(skb, mac_da);
 	llc_pdu_decode_ssap(skb, &dsap);