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usb: get rid of pointless access_ok() calls

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in all affected cases addresses are passed only to
copy_from()_user or copy_to_user().

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-04-23 10:27:20 -04:00
parent e6c0433e27
commit fe6bb59f4d
3 changed files with 0 additions and 17 deletions
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2
drivers/usb/core/devices.c
View File

@ -598,8 +598,6 @@ static ssize_t usb_device_read(struct file *file, char __user *buf,
return -EINVAL;
if (nbytes <= 0)
return 0;
if (!access_ok(buf, nbytes))
return -EFAULT;
mutex_lock(&usb_bus_idr_lock);
/* print devices for all busses */

9
drivers/usb/core/devio.c
View File

@ -1127,11 +1127,6 @@ static int proc_control(struct usb_dev_state *ps, void __user *arg)
ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
ctrl.wIndex, ctrl.wLength);
if (ctrl.bRequestType & 0x80) {
if (ctrl.wLength && !access_ok(ctrl.data,
ctrl.wLength)) {
ret = -EINVAL;
goto done;
}
pipe = usb_rcvctrlpipe(dev, 0);
snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
@ -1216,10 +1211,6 @@ static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
}
tmo = bulk.timeout;
if (bulk.ep & 0x80) {
if (len1 && !access_ok(bulk.data, len1)) {
ret = -EINVAL;
goto done;
}
snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
usb_unlock_device(dev);

6
drivers/usb/gadget/function/f_hid.c
View File

@ -252,9 +252,6 @@ static ssize_t f_hidg_read(struct file *file, char __user *buffer,
if (!count)
return 0;
if (!access_ok(buffer, count))
return -EFAULT;
spin_lock_irqsave(&hidg->read_spinlock, flags);
#define READ_COND (!list_empty(&hidg->completed_out_req))
@ -339,9 +336,6 @@ static ssize_t f_hidg_write(struct file *file, const char __user *buffer,
unsigned long flags;
ssize_t status = -ENOMEM;
if (!access_ok(buffer, count))
return -EFAULT;
spin_lock_irqsave(&hidg->write_spinlock, flags);
#define WRITE_COND (!hidg->write_pending)