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[lts-9.2] veth: Fix use after free in XDP_REDIRECT #262

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Merged
merged 1 commit into from
May 14, 2025
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[lts-9.2] veth: Fix use after free in XDP_REDIRECT #262

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6 changes: 2 additions & 4 deletions drivers/net/veth.c
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Original file line number Diff line number Diff line change
Expand Up @@ -712,7 +712,8 @@ static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,
u32 frame_sz;

if (skb_shared(skb) || skb_head_is_locked(skb) ||
skb_shinfo(skb)->nr_frags) {
skb_shinfo(skb)->nr_frags ||
skb_headroom(skb) < XDP_PACKET_HEADROOM) {
u32 size, len, max_head_size, off;
struct sk_buff *nskb;
struct page *page;
Expand Down Expand Up @@ -777,9 +778,6 @@ static int veth_convert_skb_to_xdp_buff(struct veth_rq *rq,

consume_skb(skb);
skb = nskb;
} else if (skb_headroom(skb) < XDP_PACKET_HEADROOM &&
pskb_expand_head(skb, VETH_XDP_HEADROOM, 0, GFP_ATOMIC)) {
goto drop;
}

/* SKB "head" area always have tailroom for skb_shared_info */
Expand Down