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: omap-for-v3.11/fixes-for-merge-window~76^2~226
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=12a7ad3b810e77137d0caf97a6dd97591e075b30;p=pandora-kernel.git

zram: avoid access beyond the zram device

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>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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