Description: netfilter: nf_nat_snmp_basic: add missing length checks in ASN.1 cbs
References:
 https://bugs.chromium.org/p/project-zero/issues/detail?id=1776
Notes:
 carnil> Introduced with cc2d58634e0f489d28b5564c05abc69930b4d920 (4.16-rc1)
Bugs:
upstream: released (5.0-rc7) [c4c07b4d6fa1f11880eab8e076d3d060ef3f55fc]
4.19-upstream-stable: released (4.19.25) [6a3f7237871c4d5c090ab9a6fce3ba6a1baf1f82]
4.9-upstream-stable: N/A "Vulnerable code not present"
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (4.19.28-1)
4.9-stretch-security: N/A "Vulnerable code not present"
3.16-jessie-security: N/A "Vulnerable code not present"