diff options
| author | Zheng Wang <zyytlz.wz@163.com> | 2023-03-08 00:43:38 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-03-09 15:46:14 +0100 |
| commit | 3882e26e3ef02ccb5213920e8492204c53433f58 (patch) | |
| tree | 7219a87de241cbfca6704fa4560a7ba90f460b65 | |
| parent | 087592395a967db066e3f61ddc8f2b515aabe972 (diff) | |
memstick: r592: Fix UAF bug in r592_remove due to race condition
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>
| -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) { |