Description: net: double-free and memory corruption in get_net_ns_by_id()
References:
 http://www.openwall.com/lists/oss-security/2018/01/05/1
 https://marc.info/?l=linux-netdev&m=151370451121029&w=2
 https://marc.info/?t=151370468900001&r=1&w=2
 https://bugzilla.redhat.com/show_bug.cgi?id=1531174
Notes:
Bugs:
upstream: released (4.15-rc5) [21b5944350052d2583e82dd59b19a9ba94a007f0]
4.9-upstream-stable: released (4.9.74) [03c93293a83a603fc5b87fc15321f392d3cf0043]
3.16-upstream-stable: N/A "Vulnerable code not present"
3.2-upstream-stable: N/A "Vulnerable code not present"
sid: released (4.14.12-1)
4.9-stretch-security: released (4.9.80-1)
3.16-jessie-security: N/A "Vulnerable code not present"
3.2-wheezy-security: N/A "Vulnerable code not present"