UPSTREAM: 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
Bug: 287729043
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:
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:
Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by:  Sasha Levin <sashal@kernel.org>
(cherry picked from commit 9a342d4eb9fb8e52f7d1afe088a79513f3f9a9a5)
Signed-off-by:
Sasha Levin <sashal@kernel.org>
(cherry picked from commit 9a342d4eb9fb8e52f7d1afe088a79513f3f9a9a5)
Signed-off-by:  Lee Jones <joneslee@google.com>
Change-Id: Idb15f593287ebaeec294b3e276126306fa6743ba
Lee Jones <joneslee@google.com>
Change-Id: Idb15f593287ebaeec294b3e276126306fa6743ba
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