[PATCH nft] payload: fix endianess issue in payload_expr_pctx_update()

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Use constant_data_ptr() to point to the right memory position on
big endian when exporting data that is stored in a larger variable.

Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
 src/payload.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/payload.c b/src/payload.c
index ebf8079..83742fb 100644
--- a/src/payload.c
+++ b/src/payload.c
@@ -79,8 +79,8 @@ static void payload_expr_pctx_update(struct proto_ctx *ctx,
 
 	/* Export the data in the correct byte order */
 	assert(right->len / BITS_PER_BYTE <= sizeof(proto));
-	mpz_export_data(&proto, right->value, right->byteorder,
-			right->len / BITS_PER_BYTE);
+	mpz_export_data(constant_data_ptr(proto, right->len), right->value,
+			right->byteorder, right->len / BITS_PER_BYTE);
 
 	base = ctx->protocol[left->payload.base].desc;
 	desc = proto_find_upper(base, proto);
-- 
1.7.10.4

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