diff options
| author | Zheng Wang | 2023-03-08 00:43:38 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-05-24 17:32:35 +0100 |
| commit | 9a342d4eb9fb8e52f7d1afe088a79513f3f9a9a5 (patch) | |
| tree | 223352dadd06e75a4990d4a1a6e5075be377de3f | |
| parent | 110d4202522373d629d14597af9bac97eb58bd67 (diff) | |
memstick: r592: Fix UAF bug in r592_remove due to race condition
[ Upstream commit 63264422785021704c39b38f65a78ab9e4a186d7 ]
In r592_probe, dev->detect_timer was bound with r592_detect_timer.
In r592_irq function, the timer function will be invoked by mod_timer.
If we remove the module which will call hantro_release to make cleanup,
there may be a unfinished work. The possible sequence is as follows,
which will cause a typical UAF bug.
Fix it by canceling the work before cleanup in r592_remove.
CPU0 CPU1
|r592_detect_timer
r592_remove |
memstick_free_host|
put_device; |
kfree(host); |
|
| queue_work
| &host->media_checker //use
Signed-off-by: Zheng Wang <zyytlz.wz@163.com>
Link: https://lore.kernel.org/r/20230307164338.1246287-1-zyytlz.wz@163.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/memstick/host/r592.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/memstick/host/r592.c b/drivers/memstick/host/r592.c index 1d35d147552d..42bfc46842b8 100644 --- a/drivers/memstick/host/r592.c +++ b/drivers/memstick/host/r592.c @@ -829,7 +829,7 @@ static void r592_remove(struct pci_dev *pdev) /* Stop the processing thread. That ensures that we won't take any more requests */ kthread_stop(dev->io_thread); - + del_timer_sync(&dev->detect_timer); r592_enable_device(dev, false); while (!error && dev->req) { |