linux-kernel - [PATCH 2/5] usb: f_fs: fix ffs_epfile_io returning success on req alloc failure

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Date:	Mon,  4 Jan 2016 22:41:38 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Felipe Balbi <balbi@...com>, "Du, Changbin" <changbin.du@...el.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Robert Baldyga <r.baldyga@...sung.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>
Subject: [PATCH 2/5] usb: f_fs: fix ffs_epfile_io returning success on req alloc failure

In the AIO path, if allocating of a request failse, the function simply
goes to the error_lock path whose end result is returning value of ret.
However, at this point ret’s value is zero (assigned as return value from
ffs_mutex_lock).

Fix by adding ‘ret = -ENOMEM’ statement.

Signed-off-by: Michal Nazarewicz <mina86@...a86.com>
---
 drivers/usb/gadget/function/f_fs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index d1a4a86..1384220 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -793,8 +793,10 @@ static ssize_t ffs_epfile_io(struct file *file, struct ffs_io_data *io_data)
 
 		if (io_data->aio) {
 			req = usb_ep_alloc_request(ep->ep, GFP_KERNEL);
-			if (unlikely(!req))
+			if (unlikely(!req)) {
+				ret = -ENOMEM;
 				goto error_lock;
+			}
 
 			req->buf      = data;
 			req->length   = data_len;
-- 
2.6.0.rc2.230.g3dd15c0

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