From: Mathias Krause <minipli@googlemail.com>
Date: Sun, 7 Apr 2013 01:51:57 +0000 (+0000)
Subject: netrom: fix info leak via msg_name in nr_recvmsg()
X-Git-Tag: v3.2.45~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c0bf432a4c3e6870fc87debb9393cb93f638dcba;p=pandora-kernel.git

netrom: fix info leak via msg_name in nr_recvmsg()

[ Upstream commits 3ce5efad47b62c57a4f5c54248347085a750ce0e and
  c802d759623acbd6e1ee9fbdabae89159a513913 ]

In case msg_name is set 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. Also
the sax25_ndigis member does not get assigned, leaking four more
bytes.

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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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