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