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

From: Jerome Marchand
Date: Fri Jun 07 2013 - 05:29:48 EST

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@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Acked-by: Jerome Marchand <jmarchan@xxxxxxxxxx>

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