tree 9b2fd9a7ce55f7e08fd9d51a5e8525d6bbb9e4c6
parent 9b3e617f3df53822345a8573b6d358f6b9e5ed87
author Mathias Krause <minipli@googlemail.com> 1365299508 +0000
committer David S. Miller <davem@davemloft.net> 1365366480 -0400

ax25: fix info leak via msg_name in ax25_recvmsg()

When msg_namelen is non-zero the sockaddr info gets filled out, as
requested, but the code fails to initialize the padding bytes of struct
sockaddr_ax25 inserted by the compiler for alignment. Additionally the
msg_namelen value is updated to sizeof(struct full_sockaddr_ax25) but is
not always filled up to this size.

Both issues lead to the fact that the code will leak uninitialized
kernel stack bytes in net/socket.c.

Fix both issues by initializing the memory with memset(0).

Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>