Please queue up the following patch for v4.11 -stable.
Thank you.
>From 20218ba11828773f48fad8fcf23d9ba7b6cfb711 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Date: Fri, 9 Jun 2017 11:35:46 +0200
Subject: [PATCH] esp4: Fix udpencap for local TCP packets.
[ Upstream commit 0e78a87306a6f55b1c7bbafad1de62c3975953ca ]
Locally generated TCP packets are usually cloned, so we
do skb_cow_data() on this packets. After that we need to
reload the pointer to the esp header. On udpencap this
header has an offset to skb_transport_header, so take this
offset into account.
This is a backport of:
commit 0e78a87306a ("esp4: Fix udpencap for local TCP packets.")
Fixes: 67d349ed603 ("net/esp4: Fix invalid esph pointer crash")
Fixes: fca11ebde3f0 ("esp4: Reorganize esp_output")
Reported-by: Don Bowman <db@xxxxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
---
net/ipv4/esp4.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index b1e2444..9708a32 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -212,6 +212,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
u8 *iv;
u8 *tail;
u8 *vaddr;
+ int esph_offset;
int blksize;
int clen;
int alen;
@@ -392,12 +393,14 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
}
cow:
+ esph_offset = (unsigned char *)esph - skb_transport_header(skb);
+
err = skb_cow_data(skb, tailen, &trailer);
if (err < 0)
goto error;
nfrags = err;
tail = skb_tail_pointer(trailer);
- esph = ip_esp_hdr(skb);
+ esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
skip_cow:
esp_output_fill_trailer(tail, tfclen, plen, proto);
--
2.9.4