linux-kernel - [PATCH 4.0 27/55] usb: gadget: f_fs: fix check in read operation

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Message-Id: <20150708073240.481672158@linuxfoundation.org>
Date:	Wed,  8 Jul 2015 00:35:02 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Rui Miguel Silva <rui.silva@...aro.org>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH 4.0 27/55] usb: gadget: f_fs: fix check in read operation

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Rui Miguel Silva <rui.silva@...aro.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@...aro.org>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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;
 				}
 			}


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