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: v2.6.32.27~18
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7c119c7e373988b0fd80244fdcbfc7846522d1c9;p=karo-tx-linux.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>
---

diff --git a/drivers/media/video/ivtv/ivtvfb.c b/drivers/media/video/ivtv/ivtvfb.c
index fa6bb85cb4b0..6b61bb67e9d1 100644
--- a/drivers/media/video/ivtv/ivtvfb.c
+++ b/drivers/media/video/ivtv/ivtvfb.c
@@ -457,6 +457,8 @@ static int ivtvfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long ar
 			struct fb_vblank vblank;
 			u32 trace;
 
+			memset(&vblank, 0, sizeof(struct fb_vblank));
+
 			vblank.flags = FB_VBLANK_HAVE_COUNT |FB_VBLANK_HAVE_VCOUNT |
 					FB_VBLANK_HAVE_VSYNC;
 			trace = read_reg(0x028c0) >> 16;