kernel: netfilter: nf_reject_ipv6: fix potential crash in nf_send_reset6()

In the Linux kernel, the following vulnerability has been resolved: netfilter: nfrejectipv6: fix potential crash in nfsendreset6 I got a syzbot report without a repro 1 crashing in nfsendreset6 I think the issue is that dev-hardheaderlen is zero, and we attempt later to push an Ethernet header. U...