Hi Pablo, On Thu, Aug 27, 2020 at 07:28:42PM +0200, Pablo Neira Ayuso wrote: [...] > +static void nft_commit_notify(struct net *net, u32 portid) > +{ > + struct sk_buff *batch_skb = NULL, *nskb, *skb; > + unsigned char *data; > + int len; > + > + list_for_each_entry_safe(skb, nskb, &net->nft.notify_list, list) { > + if (!batch_skb) { > +new_batch: > + batch_skb = skb; > + NFT_CB(batch_skb).report = NFT_CB(skb).report; > + len = NLMSG_GOODSIZE; This doesn't account for the data in the first skb. After changing the line into 'len = NLMSG_GOODSIZE - skb->len;', the reported problem disappears and the patch works as expected. Cheers, Phil