From: Daniel Borkmann Date: Fri, 17 Feb 2017 00:56:11 +0000 (+0100) Subject: rtnl: don't account unused struct ifla_port_vsi in rtnl_port_size X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=025331df34f6722f86b467cb13a69326444ab1bc;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git rtnl: don't account unused struct ifla_port_vsi in rtnl_port_size When allocating rtnl dump messages, struct ifla_port_vsi is never dumped, so we can save header plus payload in rtnl_port_size(). Infact, attribute IFLA_PORT_VSI_TYPE and struct ifla_port_vsi are not used anywhere in the kernel. We only need to keep the nla policy should applications in user space be filling this out. Same NLA_BINARY issue exists as was fixed in 364d5716a7ad ("rtnetlink: ifla_vf_policy: fix misuses of NLA_BINARY") and others, but then again IFLA_PORT_VSI_TYPE is not used anywhere, so just add a comment that it's unused. Signed-off-by: Daniel Borkmann Signed-off-by: David S. Miller --- diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index adfb54b896da..e3286d32eca5 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -876,8 +876,6 @@ static size_t rtnl_port_size(const struct net_device *dev, { size_t port_size = nla_total_size(4) /* PORT_VF */ + nla_total_size(PORT_PROFILE_MAX) /* PORT_PROFILE */ - + nla_total_size(sizeof(struct ifla_port_vsi)) - /* PORT_VSI_TYPE */ + nla_total_size(PORT_UUID_MAX) /* PORT_INSTANCE_UUID */ + nla_total_size(PORT_UUID_MAX) /* PORT_HOST_UUID */ + nla_total_size(1) /* PROT_VDP_REQUEST */ @@ -1491,14 +1489,19 @@ static const struct nla_policy ifla_port_policy[IFLA_PORT_MAX+1] = { [IFLA_PORT_VF] = { .type = NLA_U32 }, [IFLA_PORT_PROFILE] = { .type = NLA_STRING, .len = PORT_PROFILE_MAX }, - [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, - .len = sizeof(struct ifla_port_vsi)}, [IFLA_PORT_INSTANCE_UUID] = { .type = NLA_BINARY, .len = PORT_UUID_MAX }, [IFLA_PORT_HOST_UUID] = { .type = NLA_STRING, .len = PORT_UUID_MAX }, [IFLA_PORT_REQUEST] = { .type = NLA_U8, }, [IFLA_PORT_RESPONSE] = { .type = NLA_U16, }, + + /* Unused, but we need to keep it here since user space could + * fill it. It's also broken with regard to NLA_BINARY use in + * combination with structs. + */ + [IFLA_PORT_VSI_TYPE] = { .type = NLA_BINARY, + .len = sizeof(struct ifla_port_vsi) }, }; static const struct nla_policy ifla_xdp_policy[IFLA_XDP_MAX + 1] = {