From: Jiang Liu <liuj97@gmail.com>
Date: Thu, 6 Jun 2013 16:07:26 +0000 (+0800)
Subject: zram: avoid access beyond the zram device
X-Git-Tag: v3.2.49~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=624d1705fa1d6e4c647ca5859ecd921748bd85bf;p=pandora-kernel.git

zram: avoid access beyond the zram device

commit 12a7ad3b810e77137d0caf97a6dd97591e075b30 upstream.

Function valid_io_request() should verify the entire request are within
the zram device address range. Otherwise it may cause invalid memory
access when accessing/modifying zram->meta->table[index] because the
'index' is out of range. Then it may access non-exist memory, randomly
modify memory belong to other subsystems, which is hard to track down.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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