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netfilter: xt_HL: prefer skb_ensure_writable

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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@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2019-05-23 15:44:10 +02:00 committed by Pablo Neira Ayuso
parent 7418ee4c88
commit 8e03707f11
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/xt_HL.c
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@ -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);