[PATCH v3 01/10] zram: avoid invalid memory access in zram_exit()

Jerome Marchand jmarchan at redhat.com
Fri Jun 7 09:29:20 UTC 2013


On 06/06/2013 06:07 PM, Jiang Liu wrote:
> Memory for zram->disk object may have already been freed after returning
> from destroy_device(zram), then it's unsafe for zram_reset_device(zram)
> to access zram->disk again.
> 
> We can't solve this bug by flipping the order of destroy_device(zram)
> and zram_reset_device(zram), that will cause deadlock issues to the
> zram sysfs handler.
> 
> So fix it by holding an extra reference to zram->disk before calling
> destroy_device(zram).
> 
> Signed-off-by: Jiang Liu <jiang.liu at huawei.com>
> Cc: stable at vger.kernel.org

Acked-by: Jerome Marchand <jmarchan at redhat.com>





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