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https://github.com/Divested-Mobile/DivestOS-Build.git
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35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
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From 6a3b8afdf97e77c0b64005b23fa6d32025d922e5 Mon Sep 17 00:00:00 2001
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From: Zhen Kong <zkong@codeaurora.org>
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Date: Mon, 27 Feb 2017 13:41:07 -0800
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Subject: qseecom: add mutex around qseecom_set_client_mem_param
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Add mutex around qseecom_set_client_mem_param to prevent an
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ioctl thread modifying and corrupting data which is being
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processed by another ioctl in the other thread
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Change-Id: I0cfb8afab4001c2913be693dfe44c761b9568893
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Signed-off-by: Zhen Kong <zkong@codeaurora.org>
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---
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drivers/misc/qseecom.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drivers/misc/qseecom.c b/drivers/misc/qseecom.c
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index f8819e4..2a4cc5b 100644
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--- a/drivers/misc/qseecom.c
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+++ b/drivers/misc/qseecom.c
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@@ -6982,7 +6982,11 @@ long qseecom_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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break;
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}
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pr_debug("SET_MEM_PARAM: qseecom addr = 0x%pK\n", data);
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+ mutex_lock(&app_access_lock);
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+ atomic_inc(&data->ioctl_count);
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ret = qseecom_set_client_mem_param(data, argp);
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+ atomic_dec(&data->ioctl_count);
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+ mutex_unlock(&app_access_lock);
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if (ret)
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pr_err("failed Qqseecom_set_mem_param request: %d\n",
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ret);
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--
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cgit v1.1
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