Also, make the argument to be only the needed size of the header we're altering, no need to pull in the full packet into linear area. Signed-off-by: Florian Westphal <fw@xxxxxxxxx> --- net/netfilter/xt_HL.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/netfilter/xt_HL.c b/net/netfilter/xt_HL.c index 4653b071bed4..a37b8824221f 100644 --- a/net/netfilter/xt_HL.c +++ b/net/netfilter/xt_HL.c @@ -32,7 +32,7 @@ ttl_tg(struct sk_buff *skb, const struct xt_action_param *par) const struct ipt_TTL_info *info = par->targinfo; int new_ttl; - if (!skb_make_writable(skb, skb->len)) + if (skb_ensure_writable(skb, sizeof(*iph))) return NF_DROP; iph = ip_hdr(skb); @@ -72,7 +72,7 @@ hl_tg6(struct sk_buff *skb, const struct xt_action_param *par) const struct ip6t_HL_info *info = par->targinfo; int new_hl; - if (!skb_make_writable(skb, skb->len)) + if (skb_ensure_writable(skb, sizeof(*ip6h))) return NF_DROP; ip6h = ipv6_hdr(skb); -- 2.21.0
