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Fix retrieve user value in IOCTL_VALSET_NUM case #359

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Fix retrieve user value in IOCTL_VALSET_NUM case #359

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5 changes: 4 additions & 1 deletion examples/ioctl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ static long test_ioctl_ioctl(struct file *filp, unsigned int cmd,
struct test_ioctl_data *ioctl_data = filp->private_data;
int retval = 0;
unsigned char val;
int user_val = 0;
struct ioctl_arg data;
memset(&data, 0, sizeof(data));

Expand Down Expand Up @@ -75,7 +76,9 @@ static long test_ioctl_ioctl(struct file *filp, unsigned int cmd,
break;

case IOCTL_VALSET_NUM:
ioctl_num = arg;
if (get_user(user_val, (int __user *)arg))
return -EFAULT;
ioctl_num = user_val;
break;

default:
Expand Down