Description: usb: cdc-acm: make sure a refcount is taken early enough
References:
 http://www.openwall.com/lists/oss-security/2019/12/03/4
Notes:
Bugs:
upstream: released (5.3-rc5) [c52873e5a1ef72f845526d9f6a50704433f9c625]
4.19-upstream-stable: released (4.19.68) [c02c0249ce5523a7a264136ed36f857b85555bac]
4.9-upstream-stable: released (4.9.190) [fccd6134d5addf2be1407e3250efdc854b5c5d8a]
3.16-upstream-stable: released (3.16.78) [3a8f54a68c9868ddae64603f2ddee082c1737075]
sid: released (5.2.17-1)
4.19-buster-security: released (4.19.87-1)
4.9-stretch-security: released (4.9.210-1)
3.16-jessie-security: released (3.16.81-1)