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Subject: media: venus: fix use after free bug in venus_remove due to race condition
Author: Zheng Wang <zyytlz.wz@xxxxxxx>
Date: Tue Jun 18 14:55:59 2024 +0530
in venus_probe, core->work is bound with venus_sys_error_handler, which is
used to handle error. The code use core->sys_err_done to make sync work.
The core->work is started in venus_event_notify.
If we call venus_remove, there might be an unfished work. The possible
sequence is as follows:
CPU0 CPU1
|venus_sys_error_handler
venus_remove |
hfi_destroy |
venus_hfi_destroy |
kfree(hdev); |
|hfi_reinit
|venus_hfi_queues_reinit
|//use hdev
Fix it by canceling the work in venus_remove.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: af2c3834c8ca ("[media] media: venus: adding core part and helper functions")
Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
Signed-off-by: Dikshita Agarwal <quic_dikshita@xxxxxxxxxxx>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@xxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
drivers/media/platform/qcom/venus/core.c | 1 +
1 file changed, 1 insertion(+)
---
diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 165c947a6703..84e95a46dfc9 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -430,6 +430,7 @@ static void venus_remove(struct platform_device *pdev)
struct device *dev = core->dev;
int ret;
+ cancel_delayed_work_sync(&core->work);
ret = pm_runtime_get_sync(dev);
WARN_ON(ret < 0);
