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Message-Id: <1442597421-3641-2-git-send-email-eu@felipetonello.com>
Date:	Fri, 18 Sep 2015 18:30:20 +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 2/3] usb: chipidea: udc: improve error handling on ep_queue

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

_ep_queue() didn't check for errors when using add_td_to_list()
which can fail if dma_pool_alloc fails, thus causing a kernel
panic when lastnode->ptr is NULL.

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

Changes for v2:
  - Use separate patch for cleanups.

 drivers/usb/chipidea/udc.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index c936c72..7169113e 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -435,19 +435,27 @@ static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
 	if (hwreq->req.dma % PAGE_SIZE)
 		pages--;
 
-	if (rest == 0)
-		add_td_to_list(hwep, hwreq, 0);
+	if (rest == 0) {
+		ret = add_td_to_list(hwep, hwreq, 0);
+		if (ret < 0)
+			goto done;
+	}
 
 	while (rest > 0) {
 		unsigned count = min(hwreq->req.length - hwreq->req.actual,
 					(unsigned)(pages * CI_HDRC_PAGE_SIZE));
-		add_td_to_list(hwep, hwreq, count);
+		ret = add_td_to_list(hwep, hwreq, count);
+		if (ret < 0)
+			goto done;
 		rest -= count;
 	}
 
 	if (hwreq->req.zero && hwreq->req.length
-	    && (hwreq->req.length % hwep->ep.maxpacket == 0))
-		add_td_to_list(hwep, hwreq, 0);
+	    && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
+		ret = add_td_to_list(hwep, hwreq, 0);
+		if (ret < 0)
+			goto done;
+	}
 
 	firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
 
-- 
2.1.4

--
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