xen/netback: Ensure protocol headers don't fall in the non-linear area

xen/netback: Ensure protocol headers don’t fall in the non-linear area

This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven.
This ID is fixed in Linux Kernel version v6.0.13 by commit e8851d841fe4f29b613a00de45f39c80dbfdb975, it was introduced in version v3.19 by commit 7e5d7753956b374516530e156c5e8aa19652398d. For more details please see the references link.