From: Dan Rosenberg <drosenberg@vsecurity.com>
Date: Wed, 15 Sep 2010 21:44:22 +0000 (-0300)
Subject: V4L/DVB: ivtvfb: prevent reading uninitialized stack memory
X-Git-Tag: v2.6.27.57~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be609a1fca672655bf831d296685f33ba330e007;p=pandora-kernel.git

V4L/DVB: ivtvfb: prevent reading uninitialized stack memory

commit 405707985594169cfd0b1d97d29fcb4b4c6f2ac9 upstream.

The FBIOGET_VBLANK device ioctl allows unprivileged users to read 16
bytes of uninitialized stack memory, because the "reserved" member of
the fb_vblank struct declared on the stack is not altered or zeroed
before being copied back to the user.  This patch takes care of it.

Signed-off-by: Dan Rosenberg <dan.j.rosenberg@gmail.com>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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