kernel: net: Fix memory leak/corruption on VLAN GRO_DROP

The Generic Receive Offload GRO implementation in the Linux kernel 2.6.18 on Red Hat Enterprise Linux 5 and 2.6.32 on Red Hat Enterprise Linux 6, as used in Red Hat Enterprise Virtualization RHEV Hypervisor and other products, allows remote attackers to cause a denial of service via crafted VLAN...