Description: xsk: Add missing check on user supplied headroom size
References:
 https://bugzilla.kernel.org/show_bug.cgi?id=207225
Notes:
 bwh> xsk was introduced in 4.18
Bugs:
upstream: released (5.7-rc2) [99e3a236dd43d06c65af0a2ef9cb44306aef6e02]
4.19-upstream-stable: released (4.19.118) [ad8fb61c184fe0f8d1e0b5b954d010fb9f94a6ee]
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (5.6.7-1)
4.19-buster-security: released (4.19.118-1)
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"