CVE request: kernel: AF_LLC getsockname 5-Byte Stack Disclosure

[Eugene Teo <eugeneteo () kernel sg>]

sllc_arphrd member of sockaddr_llc might not be changed. Zero sllc 
before copying to the above layer's structure.

Note that LLC sockets are restricted to root since v2.6.25-rc9 (see 
commit 3480c63b).

Upstream commit:
http://git.kernel.org/linus/28e9fc592cb8c7a43e4d3147b38be6032a0e81bc

Reproducer:
http://jon.oberheide.org/files/llc-getsockname-leak.c

Reference:
https://bugzilla.redhat.com/show_bug.cgi?id=519305

Thanks, Eugene