The patch titled Subject: zram: fix uninitialized ZRAM not releasing backing device has been added to the -mm mm-hotfixes-unstable branch. Its filename is zram-fix-uninitialized-zram-not-releasing-backing-device.patch

This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches...

This patch will later appear in the mm-hotfixes-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------ From: Kairui Song kasong@tencent.com Subject: zram: fix uninitialized ZRAM not releasing backing device Date: Thu, 5 Dec 2024 02:02:24 +0800

Setting backing device is done before ZRAM initialization. If we set the backing device, then remove the ZRAM module without initializing the device, the backing device reference will be leaked and the device will be hold forever.

Fix this by always check and release the backing device when resetting or removing ZRAM.

Link: https://lkml.kernel.org/r/20241204180224.31069-3-ryncsn@gmail.com Fixes: 013bf95a83ec ("zram: add interface to specif backing device") Signed-off-by: Kairui Song kasong@tencent.com Reported-by: Desheng Wu deshengwu@tencent.com Cc: Minchan Kim minchan@kernel.org Cc: Sergey Senozhatsky senozhatsky@chromium.org Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

drivers/block/zram/zram_drv.c | 3 +++ 1 file changed, 3 insertions(+)

--- a/drivers/block/zram/zram_drv.c~zram-fix-uninitialized-zram-not-releasing-backing-device +++ a/drivers/block/zram/zram_drv.c @@ -2335,6 +2335,9 @@ static void zram_reset_device(struct zra zram->limit_pages = 0;

if (!init_done(zram)) { + /* Backing device could be set before ZRAM initialization. */ + reset_bdev(zram); + up_write(&zram->init_lock); return; } _

Patches currently in -mm which might be from kasong@tencent.com are

zram-refuse-to-use-zero-sized-block-device-as-backing-device.patch zram-fix-uninitialized-zram-not-releasing-backing-device.patch