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HID: Push down BKL into ioctl handler in hidraw

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In this case I simply wrapped it as code review suggests the locking
already terminally broken and I didn't want to make it first. See added
comment

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Alan Cox 2008-05-26 11:25:26 +02:00 committed by Jiri Kosina
parent 7961df1681
commit 979c407e3b
1 changed files with 24 additions and 22 deletions
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46
drivers/hid/hidraw.c
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@ -105,6 +105,7 @@ static ssize_t hidraw_read(struct file *file, char __user *buffer, size_t count,
static ssize_t hidraw_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
unsigned int minor = iminor(file->f_path.dentry->d_inode);
/* FIXME: What stops hidraw_table going NULL */
struct hid_device *dev = hidraw_table[minor]->hid;
__u8 *buf;
int ret = 0;
@ -214,35 +215,38 @@ static int hidraw_release(struct inode * inode, struct file * file)
return 0;
}
static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
static long hidraw_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
unsigned int minor = iminor(inode);
long ret = 0;
/* FIXME: What stops hidraw_table going NULL */
struct hidraw *dev = hidraw_table[minor];
void __user *user_arg = (void __user*) arg;
lock_kernel();
switch (cmd) {
case HIDIOCGRDESCSIZE:
if (put_user(dev->hid->rsize, (int __user *)arg))
return -EFAULT;
return 0;
ret = -EFAULT;
break;
case HIDIOCGRDESC:
{
__u32 len;
if (get_user(len, (int __user *)arg))
return -EFAULT;
if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
return -EINVAL;
if (copy_to_user(user_arg + offsetof(
struct hidraw_report_descriptor,
value[0]),
dev->hid->rdesc,
min(dev->hid->rsize, len)))
return -EFAULT;
return 0;
ret = -EFAULT;
else if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
ret = -EINVAL;
else if (copy_to_user(user_arg + offsetof(
struct hidraw_report_descriptor,
value[0]),
dev->hid->rdesc,
min(dev->hid->rsize, len)))
ret = -EFAULT;
break;
}
case HIDIOCGRAWINFO:
{
@ -252,15 +256,13 @@ static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd
dinfo.vendor = dev->hid->vendor;
dinfo.product = dev->hid->product;
if (copy_to_user(user_arg, &dinfo, sizeof(dinfo)))
return -EFAULT;
return 0;
ret = -EFAULT;
break;
}
default:
printk(KERN_EMERG "hidraw: unsupported ioctl() %x\n",
cmd);
ret = -ENOTTY;
}
return -EINVAL;
return ret;
}
static const struct file_operations hidraw_ops = {
@ -270,7 +272,7 @@ static const struct file_operations hidraw_ops = {
.poll = hidraw_poll,
.open = hidraw_open,
.release = hidraw_release,
.ioctl = hidraw_ioctl,
.unlocked_ioctl = hidraw_ioctl,
};
void hidraw_report_event(struct hid_device *hid, u8 *data, int len)