diff options
author | Dan Carpenter <dan.carpenter@oracle.com> | 2020-04-06 17:51:19 +0300 |
---|---|---|
committer | Felipe Balbi <balbi@kernel.org> | 2020-04-17 12:26:26 +0300 |
commit | a7b778357ca48df71bbaad6612beaca30bd96e54 (patch) | |
tree | aa00051dd3aefcd61aa5eb47da4b7302042f0ff5 /drivers/usb/gadget | |
parent | 0666aa539e18a4e35770a19d5576e06cd6a8c76e (diff) |
usb: raw-gadget: Fix copy_to/from_user() checks
The copy_to/from_user() functions return the number of bytes remaining
but we want to return negative error codes. I changed a couple checks
in raw_ioctl_ep_read() and raw_ioctl_ep0_read() to show that we still
we returning zero on error.
Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r-- | drivers/usb/gadget/legacy/raw_gadget.c | 46 |
1 files changed, 22 insertions, 24 deletions
diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c index 21d3fee7d14b..ca7d95bf7397 100644 --- a/drivers/usb/gadget/legacy/raw_gadget.c +++ b/drivers/usb/gadget/legacy/raw_gadget.c @@ -400,9 +400,8 @@ static int raw_ioctl_init(struct raw_dev *dev, unsigned long value) char *udc_device_name; unsigned long flags; - ret = copy_from_user(&arg, (void __user *)value, sizeof(arg)); - if (ret) - return ret; + if (copy_from_user(&arg, (void __user *)value, sizeof(arg))) + return -EFAULT; switch (arg.speed) { case USB_SPEED_UNKNOWN: @@ -509,15 +508,13 @@ out_unlock: static int raw_ioctl_event_fetch(struct raw_dev *dev, unsigned long value) { - int ret = 0; struct usb_raw_event arg; unsigned long flags; struct usb_raw_event *event; uint32_t length; - ret = copy_from_user(&arg, (void __user *)value, sizeof(arg)); - if (ret) - return ret; + if (copy_from_user(&arg, (void __user *)value, sizeof(arg))) + return -EFAULT; spin_lock_irqsave(&dev->lock, flags); if (dev->state != STATE_DEV_RUNNING) { @@ -545,20 +542,19 @@ static int raw_ioctl_event_fetch(struct raw_dev *dev, unsigned long value) return -ENODEV; } length = min(arg.length, event->length); - ret = copy_to_user((void __user *)value, event, - sizeof(*event) + length); - return ret; + if (copy_to_user((void __user *)value, event, sizeof(*event) + length)) + return -EFAULT; + + return 0; } static void *raw_alloc_io_data(struct usb_raw_ep_io *io, void __user *ptr, bool get_from_user) { - int ret; void *data; - ret = copy_from_user(io, ptr, sizeof(*io)); - if (ret) - return ERR_PTR(ret); + if (copy_from_user(io, ptr, sizeof(*io))) + return ERR_PTR(-EFAULT); if (io->ep >= USB_RAW_MAX_ENDPOINTS) return ERR_PTR(-EINVAL); if (!usb_raw_io_flags_valid(io->flags)) @@ -673,12 +669,13 @@ static int raw_ioctl_ep0_read(struct raw_dev *dev, unsigned long value) if (IS_ERR(data)) return PTR_ERR(data); ret = raw_process_ep0_io(dev, &io, data, false); - if (ret < 0) { - kfree(data); - return ret; - } + if (ret) + goto free; + length = min(io.length, (unsigned int)ret); - ret = copy_to_user((void __user *)(value + sizeof(io)), data, length); + if (copy_to_user((void __user *)(value + sizeof(io)), data, length)) + ret = -EFAULT; +free: kfree(data); return ret; } @@ -967,12 +964,13 @@ static int raw_ioctl_ep_read(struct raw_dev *dev, unsigned long value) if (IS_ERR(data)) return PTR_ERR(data); ret = raw_process_ep_io(dev, &io, data, false); - if (ret < 0) { - kfree(data); - return ret; - } + if (ret) + goto free; + length = min(io.length, (unsigned int)ret); - ret = copy_to_user((void __user *)(value + sizeof(io)), data, length); + if (copy_to_user((void __user *)(value + sizeof(io)), data, length)) + ret = -EFAULT; +free: kfree(data); return ret; } |