From: Yossi Kuperman <>

IPv6 payload length indicates the size of the payload, including any
extension headers. In xfrm6_transport_finish, ipv6_hdr(skb)->payload_len
is set to the payload size only, regardless of the presence of any
extension headers.

After ESP GRO transport mode decapsulation, ipv6_rcv trims the packet
according to the wrong payload_len, thus corrupting the packet.

Set payload_len to account for extension headers as well.

Fixes: 716062fd4c2f ("[IPSEC]: Merge most of the input path")
Signed-off-by: Yossi Kuperman <>
 net/ipv6/xfrm6_input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index 08a807b..3ef5d91 100644
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -43,8 +43,8 @@ int xfrm6_transport_finish(struct sk_buff *skb, int async)
                return 1;
-       ipv6_hdr(skb)->payload_len = htons(skb->len);
        __skb_push(skb, skb->data - skb_network_header(skb));
+       ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
        if (xo && (xo->flags & XFRM_GRO)) {

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