Description: drm/i915/gvt: Fix mmap range check
References:
 https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00249.html
Notes:
 carnil> Commit fixes 659643f7d814 ("drm/i915/gvt/kvmgt: add vfio/mdev
 carnil> support to KVMGT") in 4.10-rc1.
Bugs:
upstream: released (5.0-rc3) [51b00d8509dc69c98740da2ad07308b630d3eb7d]
4.19-upstream-stable: released (4.19.17) [ac8b9e8e7ddd69f3efa91e8a99312de5729382c0]
4.9-upstream-stable: N/A "Vulnerable code introduced later"
3.16-upstream-stable: N/A "Vulnerable code introduced later"
sid: released (4.19.20-1)
4.9-stretch-security: N/A "Vulnerable code introduced later"
3.16-jessie-security: N/A "Vulnerable code introduced later"