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Kairui Song 6aa65cda93 zram: refuse to use zero sized block device as backing device ... commit be48c412f6 upstream. Patch series "zram: fix backing device setup issue", v2. This series fixes two bugs of backing device setting: - ZRAM should reject using a zero sized (or the uninitialized ZRAM device itself) as the backing device. - Fix backing device leaking when removing a uninitialized ZRAM device. This patch (of 2): 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. Link: https://lkml.kernel.org/r/20241209165717.94215-1-ryncsn@gmail.com Link: https://lkml.kernel.org/r/20241209165717.94215-2-ryncsn@gmail.com Fixes: 013bf95a83 ("zram: add interface to specif backing device") Signed-off-by: Kairui Song <kasong@tencent.com> Reported-by: Desheng Wu <deshengwu@tencent.com> Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		History 2025-01-09 13:28:34 +01:00
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Kconfig	zram: break the strict dependency from lzo	2020-12-15 12:13:47 -08:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
zcomp.c	zram: do not lookup algorithm in backends table	2022-08-25 11:40:34 +02:00
zcomp.h	zram: Use local lock to protect per-CPU data	2020-05-28 10:31:10 +02:00
zram_drv.c	zram: refuse to use zero sized block device as backing device	2025-01-09 13:28:34 +01:00
zram_drv.h	Merge branch 'akpm' (patches from Andrew)	2021-07-02 12:08:10 -07:00