linux-kernel - [PATCH] usb: chipidea: udc: improve error handling on _hardware

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Message-Id: <1445942192-4616-1-git-send-email-eu@felipetonello.com>
Date:	Tue, 27 Oct 2015 10:36:32 +0000
From:	"Felipe F. Tonello" <eu@...ipetonello.com>
To:	linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Peter Chen <Peter.Chen@...escale.com>
Subject: [PATCH] usb: chipidea: udc: improve error handling on _hardware_enqueue

_hardware_enqueue() 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>
---
 drivers/usb/chipidea/udc.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index e19d8b8..d4750f2 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -435,19 +435,28 @@ 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 && hwep->dir == TX
-	    && (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);
 
-- 
2.5.0

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