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    Subject[PATCH 5.12 420/700] netfilter: nft_exthdr: check for IPv6 packet before further processing
    Date
    From: Pablo Neira Ayuso <pablo@netfilter.org>

    [ Upstream commit cdd73cc545c0fb9b1a1f7b209f4f536e7990cff4 ]

    ipv6_find_hdr() does not validate that this is an IPv6 packet. Add a
    sanity check for calling ipv6_find_hdr() to make sure an IPv6 packet
    is passed for parsing.

    Fixes: 96518518cc41 ("netfilter: add nftables")
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    net/netfilter/nft_exthdr.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/net/netfilter/nft_exthdr.c b/net/netfilter/nft_exthdr.c
    index f64f0017e9a5..670dd146fb2b 100644
    --- a/net/netfilter/nft_exthdr.c
    +++ b/net/netfilter/nft_exthdr.c
    @@ -42,6 +42,9 @@ static void nft_exthdr_ipv6_eval(const struct nft_expr *expr,
    unsigned int offset = 0;
    int err;

    + if (pkt->skb->protocol != htons(ETH_P_IPV6))
    + goto err;
    +
    err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL);
    if (priv->flags & NFT_EXTHDR_F_PRESENT) {
    nft_reg_store8(dest, err >= 0);
    --
    2.30.2


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