Description: slcan: Don't transmit uninitialized stack data in padding 
References:
 https://lore.kernel.org/netdev/20200401100639.20199-1-rpalethorpe@suse.com/
Notes:
Bugs:
upstream: needed
4.19-upstream-stable: needed
4.9-upstream-stable: needed
3.16-upstream-stable: needed
sid: needed
4.19-buster-security: needed
4.9-stretch-security: needed
3.16-jessie-security: needed