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authorZheng Wang <zyytlz.wz@163.com>2023-03-07 19:43:38 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2023-03-23 13:30:19 +0300
commit63264422785021704c39b38f65a78ab9e4a186d7 (patch)
treea5e76f04e1ede8f3a9a3ea1322dd234f6f35910b /drivers
parent4b4b7ac73704bfa796d2be6b96cb9072f7298861 (diff)
downloadlinux-63264422785021704c39b38f65a78ab9e4a186d7.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/memstick/host/r592.c2
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) {