netlink_linearize: use div_round_up in byteorder length

commit 25e7b99cc450490c38becb03d8bddd0199cfd3f9 upstream.

Use div_round_up() to calculate the byteorder length, otherwise fields
that take % BITS_PER_BYTE != 0 are not considered by the byteorder
expression.

Reported-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/src/netlink_linearize.c b/src/netlink_linearize.c
index 527f3fc5471d63e3f7084f8f1b2b5d404550580a..1aaa12847cef8228f2de186efc9035db0bb18ce3 100644 (file)
--- a/src/netlink_linearize.c
+++ b/src/netlink_linearize.c
@@ -740,7 +740,7 @@ static void netlink_gen_unary(struct netlink_linearize_ctx *ctx,
        netlink_put_register(nle, NFTNL_EXPR_BYTEORDER_SREG, dreg);
        netlink_put_register(nle, NFTNL_EXPR_BYTEORDER_DREG, dreg);
        nftnl_expr_set_u32(nle, NFTNL_EXPR_BYTEORDER_LEN,
-                          expr->len / BITS_PER_BYTE);
+                          div_round_up(expr->len, BITS_PER_BYTE));
        nftnl_expr_set_u32(nle, NFTNL_EXPR_BYTEORDER_SIZE,
                           byte_size);
        nftnl_expr_set_u32(nle, NFTNL_EXPR_BYTEORDER_OP,