CVE-2025-38622 net: drop UFO packets in udp_rcv_segment()

In the Linux kernel, the following vulnerability has been resolved: net: drop UFO packets in udprcvsegment When sending a packet with virtionethdr to tun device, if the gsotype in virtionethdr is SKBGSOUDP and the gsosize is less than udphdr size, below crash may happen. ------------ cut here...