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Message-Id: <1718702759-18914-1-git-send-email-quic_dikshita@quicinc.com>
Date: Tue, 18 Jun 2024 14:55:59 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
Vikash Garodia <quic_vgarodia@...cinc.com>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hans.verkuil@...co.com>
Cc: "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
Stanimir Varbanov <stanimir.varbanov@...aro.org>,
linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
linux-kernel@...r.kernel.org, Zheng Wang <zyytlz.wz@....com>,
stable@...r.kernel.org, Dikshita Agarwal <quic_dikshita@...cinc.com>
Subject: [PATCH v3] media: venus: fix use after free bug in venus_remove due to race condition
From: Zheng Wang <zyytlz.wz@....com>
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@...r.kernel.org
Fixes: af2c3834c8ca ("[media] media: venus: adding core part and helper functions")
Signed-off-by: Zheng Wang <zyytlz.wz@....com>
Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
---
Changes since v2:
- used cancel_delayed_work_sync instead of cancel_delayed_work
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 a712dd4..c139270 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -424,6 +424,7 @@ 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);
--
2.7.4
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