Patch "usb: gadget: f_fs: fix check in read operation" has been added to the 4.0-stable tree

Patch "usb: gadget: f_fs: fix check in read operation" has been added to the 4.0-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: gadget: f_fs: fix check in read operation

to the 4.0-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-gadget-f_fs-fix-check-in-read-operation.patch
and it can be found in the queue-4.0 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 342f39a6c8d34d638a87b7d5f2156adc4db2585c Mon Sep 17 00:00:00 2001
From: Rui Miguel Silva <rui.silva@linaro.org>
Date: Wed, 20 May 2015 14:53:33 +0100
Subject: usb: gadget: f_fs: fix check in read operation

From: Rui Miguel Silva <rui.silva@linaro.org>

commit 342f39a6c8d34d638a87b7d5f2156adc4db2585c upstream.

when copying to iter the size can be different then the iov count,
the check for full iov is wrong and make any read on request which
is not the exactly size of iov to return -EFAULT.

So, just check the success of the copy.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/gadget/function/f_fs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -845,7 +845,7 @@ static ssize_t ffs_epfile_io(struct file
 				ret = ep->status;
 				if (io_data->read && ret > 0) {
 					ret = copy_to_iter(data, ret, &io_data->data);
-					if (unlikely(iov_iter_count(&io_data->data)))
+					if (!ret)
 						ret = -EFAULT;
 				}
 			}


Patches currently in stable-queue which might be from rui.silva@linaro.org are

queue-4.0/usb-gadget-f_fs-fix-check-in-read-operation.patch
queue-4.0/usb-gadget-f_fs-add-extra-check-before-unregister_gadget_item.patch