netfilter: xt_HL: prefer skb_ensure_writable (8e03707f) · Commits · 戴 / test

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:

net/netfilter/xt_HL.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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);