diff options
| author | Minchan Kim <minchan@kernel.org> | 2014-01-30 15:45:58 -0800 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:47:18 +0900 |
| commit | 28a1db0c60b6eff0daba9220e785ee1080d45764 (patch) | |
| tree | 1a146cf393a60bc2292f57a3c825fb3a6ad4ba45 | |
| parent | aae371ac2c7848661f4b723ad5ac568fd93bb32f (diff) | |
| download | linux-3.10-28a1db0c60b6eff0daba9220e785ee1080d45764.tar.gz linux-3.10-28a1db0c60b6eff0daba9220e785ee1080d45764.tar.bz2 linux-3.10-28a1db0c60b6eff0daba9220e785ee1080d45764.zip | |
zram: fix race between reset and flushing pending work
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.
Change-Id: Ibc09001d1ad4a4ef852d661384259b53f0f9c19b
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Jerome Marchand <jmarchan@redhat.com>
Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/zram/zram_drv.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c index 1a1dc60d76b..a376109110f 100644 --- a/drivers/block/zram/zram_drv.c +++ b/drivers/block/zram/zram_drv.c @@ -552,14 +552,14 @@ static void zram_reset_device(struct zram *zram, bool reset_capacity) 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; |