From: Arjan van de Ven <arjan@linux.intel.com>
Date: Sat, 26 Sep 2009 18:50:25 +0000 (+0200)
Subject: ACPI: Fix bound checks for copy_from_user in the acpi /proc code
X-Git-Tag: v2.6.32-rc3~4^2^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9f65018065ee1b161a85f54132193f248a45439;p=pandora-kernel.git

ACPI: Fix bound checks for copy_from_user in the acpi /proc code

The ACPI /proc write() code takes an unsigned length argument like any write()
function, but then assigned it to a *signed* integer called "len".
Only after this is a sanity check for len done to make it not larger than 4.

Due to the type change a len < 0 is in principle also possible; this patch
adds a check for this.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
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