zram: avoid access beyond the zram device

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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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Jiang Liu 2013-06-07 00:07:26 +08:00 • committed by Greg Kroah-Hartman

parent 65c484609a

commit 12a7ad3b81

1 changed files with 12 additions and 5 deletions

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17

drivers/staging/zram/zram_drv.c

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