kernel: igb panics when receiving tag vlan packet

The igbreceiveskb function in drivers/net/igb/igbmain.c in the Intel Gigabit Ethernet aka igb subsystem in the Linux kernel before 2.6.34, when Single Root I/O Virtualization SR-IOV and promiscuous mode are enabled but no VLANs are registered, allows remote attackers to cause a denial of service...