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[ciqcbr7_9] net: sched: act_csum: validate nested VLAN headers #1454

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Merged
PlaidCat merged 1 commit into from
Jul 20, 2026
Merged

[ciqcbr7_9] net: sched: act_csum: validate nested VLAN headers #1454

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6 changes: 5 additions & 1 deletion net/sched/act_csum.c
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Original file line number Diff line number Diff line change
Expand Up @@ -572,8 +572,12 @@ static int tcf_csum(struct sk_buff *skb, const struct tc_action *a,
protocol = skb->protocol;
orig_vlan_tag_present = true;
} else {
struct vlan_hdr *vlan = (struct vlan_hdr *)skb->data;
struct vlan_hdr *vlan;

if (!pskb_may_pull(skb, VLAN_HLEN))
goto drop;

vlan = (struct vlan_hdr *)skb->data;
protocol = vlan->h_vlan_encapsulated_proto;
skb_pull(skb, VLAN_HLEN);
skb_reset_network_header(skb);
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