[PATCH v4.11 -stable] esp4: Fix udpencap for local TCP packets.

[Steffen Klassert]

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 <d...@donbowman.ca>
Signed-off-by: Steffen Klassert <steffen.klass...@secunet.com>
---
 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);
-- 
2.7.4