tree 873e9b2ad4574c1f631d39654e2feea6e629485f
parent 9735bccca9d144ab223cab2cadcd7dfa96a958bf
author Dan Rosenberg <drosenberg@vsecurity.com> 1284587062 -0300
committer Greg Kroah-Hartman <gregkh@suse.de> 1291929861 -0800

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>