On (24/12/05 02:02), Kairui Song wrote:
> From: Kairui Song <kasong@xxxxxxxxxxx>
>
> Setting a zero sized block device as backing device is pointless, and
> one can easily create a recursive loop by setting the uninitialized
> ZRAM device itself as its own backing device by (zram0 is uninitialized):
>
> echo /dev/zram0 > /sys/block/zram0/backing_dev
>
> It's definitely a wrong config, and the module will pin itself,
> kernel should refuse doing so in the first place.
>
> By refusing to use zero sized device we avoided misuse cases
> including this one above.
>
> Fixes: 013bf95a83ec ("zram: add interface to specif backing device")
> Reported-by: Desheng Wu <deshengwu@xxxxxxxxxxx>
> Signed-off-by: Kairui Song <kasong@xxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
