From: Michael Gehring <mg@ebfe.org>
Date: Wed, 21 Mar 2012 00:26:45 +0000 (+0100)
Subject: tty/vt: handle bad user buffer in {G,P}IO_CMAP ioctl
X-Git-Tag: v3.5-rc1~146^2~30^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=871bdea6f8c64517635bec352b8bec6b72a26d80;p=pandora-kernel.git

tty/vt: handle bad user buffer in {G,P}IO_CMAP ioctl

set_get_cmap() ignored the result of {get,put}_user(), causing ioctl(vt,
{G,P}IO_CMAP, 0xdeadbeef) to silently fail.

Another side effect of this: calling the PIO_CMAP ioctl with an invalid
buffer would zero the default colormap and the palette for all vts (all
colors set to black).

Leave the default colormap intact and return -EFAULT when
reading/writing to the userspace buffer fails.

Signed-off-by: Michael Gehring <mg@ebfe.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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