From: Pablo Neira Ayuso <pablo@netfilter.org> stable inclusion from linux-4.19.228 commit a622b1fdfe1c725a6e9cf34d04e92f5c36a99606 -------------------------------- commit 4e1860a3863707e8177329c006d10f9e37e097a8 upstream. IP fragments do not come with the transport header, hence skip bogus layer 4 checksum updates. Fixes: 1814096980bb ("netfilter: nft_payload: layer 4 checksum adjustment for pseudoheader fields") Reported-and-tested-by: Steffen Weinreich <steve@weinreich.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com> Signed-off-by: Laibin Qiu <qiulaibin@huawei.com> --- net/netfilter/nft_payload.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/netfilter/nft_payload.c b/net/netfilter/nft_payload.c index b1a9f330a51f..fd87216bc0a9 100644 --- a/net/netfilter/nft_payload.c +++ b/net/netfilter/nft_payload.c @@ -194,6 +194,9 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, struct sk_buff *skb, unsigned int *l4csum_offset) { + if (pkt->xt.fragoff) + return -1; + switch (pkt->tprot) { case IPPROTO_TCP: *l4csum_offset = offsetof(struct tcphdr, check); -- 2.22.0