Linux kernel: net/irda/af_irda.c: irda_getsockopt() stack infoleak

[sohu0106 <sohu0106 () 126 com>]

net/irda/af_irda.c

Sometimes irda_getsockopt() doesn't initialize all members of list field of irda_device_list struct.  This structure is 
then copied to
userland.  It leads to leaking of contents of kernel stack memory.  We have to initialize them to zero , or it will 
allows local users to obtain potentially sensitive information from kernel stack memory by reading a copy of this 
structure

https://github.com/torvalds/linux/pull/440