This is a note to let you know that I've just added the patch titled zram: fix operator precedence to get offset to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: zram-fix-operator-precedence-to-get-offset.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 Mon Sep 17 00:00:00 2001 From: Minchan Kim <minchan@xxxxxxxxxx> Date: Thu, 13 Apr 2017 14:56:35 -0700 Subject: zram: fix operator precedence to get offset From: Minchan Kim <minchan@xxxxxxxxxx> commit 4ca82dabc9fbf7bc5322aa54d802cb3cb7b125c5 upstream. In zram_rw_page, the logic to get offset is wrong by operator precedence (i.e., "<<" is higher than "&"). With wrong offset, zram can corrupt the user's data. This patch fixes it. Fixes: 8c7f01025 ("zram: implement rw_page operation of zram") Link: http://lkml.kernel.org/r/1492042622-12074-1-git-send-email-minchan@xxxxxxxxxx Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/block/zram/zram_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -953,7 +953,7 @@ static int zram_rw_page(struct block_dev } index = sector >> SECTORS_PER_PAGE_SHIFT; - offset = sector & (SECTORS_PER_PAGE - 1) << SECTOR_SHIFT; + offset = (sector & (SECTORS_PER_PAGE - 1)) << SECTOR_SHIFT; bv.bv_page = page; bv.bv_len = PAGE_SIZE; Patches currently in stable-queue which might be from minchan@xxxxxxxxxx are queue-4.4/zram-fix-operator-precedence-to-get-offset.patch