[PATCH USB 1/2] usb: raw-gadget: fix return value of ep read ioctls

Andrey Konovalov
2020-04-24T01:10:08Z

They must return the number of bytes transferred during the data stage.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
drivers/usb/gadget/legacy/raw_gadget.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
index ca7d95bf7397..7b241992ad5a 100644
--- a/drivers/usb/gadget/legacy/raw_gadget.c
+++ b/drivers/usb/gadget/legacy/raw_gadget.c
@@ -669,12 +669,14 @@ 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)
+ if (ret < 0)
goto free;

length = min(io.length, (unsigned int)ret);
if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
ret = -EFAULT;
+ else
+ ret = length;
free:
kfree(data);
return ret;
@@ -964,12 +966,14 @@ 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)
+ if (ret < 0)
goto free;

length = min(io.length, (unsigned int)ret);
if (copy_to_user((void __user *)(value + sizeof(io)), data, length))
ret = -EFAULT;
+ else
+ ret = length;
free:
kfree(data);
return ret;
--
2.26.2.303.gf8c07b1a785-goog