This is a note to let you know that I've just added the patch titled
zram: fix race between reset and flushing pending work
to the 3.12-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-race-between-reset-and-flushing-pending-work.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From da4a04126baa3be03bc566d4a2ee0944c5e783d0 Mon Sep 17 00:00:00 2001
From: Minchan Kim <minchan@xxxxxxxxxx>
Date: Thu, 30 Jan 2014 15:45:58 -0800
Subject: zram: fix race between reset and flushing pending work
From: Minchan Kim <minchan@xxxxxxxxxx>
commit da4a04126baa3be03bc566d4a2ee0944c5e783d0 upstream.
Dan and Sergey reported that there is a racy between reset and flushing
of pending work so that it could make oops by freeing zram->meta in
reset while zram_slot_free can access zram->meta if new request is
adding during the race window.
This patch moves flush after taking init_lock so it prevents new request
so that it closes the race.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Jerome Marchand <jmarchan@xxxxxxxxxx>
Tested-by: 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/staging/zram/zram_drv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -552,14 +552,14 @@ static void zram_reset_device(struct zra
size_t index;
struct zram_meta *meta;
- flush_work(&zram->free_work);
-
down_write(&zram->init_lock);
if (!zram->init_done) {
up_write(&zram->init_lock);
return;
}
+ flush_work(&zram->free_work);
+
meta = zram->meta;
zram->init_done = 0;
Patches currently in stable-queue which might be from minchan@xxxxxxxxxx are
queue-3.12/mm-hugetlbfs-fix-hugetlbfs-optimization.patch
queue-3.12/zram-fix-race-between-reset-and-flushing-pending-work.patch
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