41 lines
1.6 KiB
Diff
41 lines
1.6 KiB
Diff
From 0e033e04c2678dbbe74a46b23fffb7bb918c288e Mon Sep 17 00:00:00 2001
|
|
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
|
|
Date: Tue, 5 Nov 2013 02:41:27 +0100
|
|
Subject: [PATCH] ipv6: fix headroom calculation in udp6_ufo_fragment
|
|
|
|
Commit 1e2bd517c108816220f262d7954b697af03b5f9c ("udp6: Fix udp
|
|
fragmentation for tunnel traffic.") changed the calculation if
|
|
there is enough space to include a fragment header in the skb from a
|
|
skb->mac_header dervived one to skb_headroom. Because we already peeled
|
|
off the skb to transport_header this is wrong. Change this back to check
|
|
if we have enough room before the mac_header.
|
|
|
|
This fixes a panic Saran Neti reported. He used the tbf scheduler which
|
|
skb_gso_segments the skb. The offsets get negative and we panic in memcpy
|
|
because the skb was erroneously not expanded at the head.
|
|
|
|
Reported-by: Saran Neti <Saran.Neti@telus.com>
|
|
Cc: Pravin B Shelar <pshelar@nicira.com>
|
|
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
net/ipv6/udp_offload.c | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c
|
|
index 08e23b0..e7359f9 100644
|
|
--- a/net/ipv6/udp_offload.c
|
|
+++ b/net/ipv6/udp_offload.c
|
|
@@ -90,7 +90,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
|
|
|
|
/* Check if there is enough headroom to insert fragment header. */
|
|
tnl_hlen = skb_tnl_header_len(skb);
|
|
- if (skb_headroom(skb) < (tnl_hlen + frag_hdr_sz)) {
|
|
+ if (skb->mac_header < (tnl_hlen + frag_hdr_sz)) {
|
|
if (gso_pskb_expand_head(skb, tnl_hlen + frag_hdr_sz))
|
|
goto out;
|
|
}
|
|
--
|
|
1.8.3.1
|
|
|