linux-kernel - [PATCH 3/3] usb: gadget: f_midi: check for error on usb_ep

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Date:	Fri, 18 Sep 2015 18:30:21 +0100
From:	eu@...ipetonello.com
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Peter Chen <Peter.Chen@...escale.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	"Felipe F. Tonello" <eu@...ipetonello.com>
Subject: [PATCH 3/3] usb: gadget: f_midi: check for error on usb_ep_queue

From: "Felipe F. Tonello" <eu@...ipetonello.com>

f_midi is not checking weather the is an error on usb_ep_queue
request, ignoring potential problems, such as memory leaks.

Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
---

Changes for v2:
  - Update code style.

 drivers/usb/gadget/function/f_midi.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
index ad50a67..c04133422 100644
--- a/drivers/usb/gadget/function/f_midi.c
+++ b/drivers/usb/gadget/function/f_midi.c
@@ -543,10 +543,16 @@ static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
 		}
 	}
 
-	if (req->length > 0)
-		usb_ep_queue(ep, req, GFP_ATOMIC);
-	else
+	if (req->length > 0) {
+		int err;
+
+		err = usb_ep_queue(ep, req, GFP_ATOMIC);
+		if (err < 0)
+			ERROR(midi, "%s queue req: %d\n",
+			      midi->out_ep->name, err);
+	} else {
 		free_ep_req(ep, req);
+	}
 }
 
 static void f_midi_in_tasklet(unsigned long data)
-- 
2.1.4

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