From e499123ed780df64a35e6cc0a8c892b282fa71a4 Mon Sep 17 00:00:00 2001
From: Gregory Herrero <gregory.herrero@intel.com>
Date: Wed, 29 Apr 2015 22:09:20 +0200
Subject: usb: dwc2: host: ensure qtb exists before dereferencing it
dwc2_hc_nak_intr could be called with a NULL qtd.
Ensure qtd exists before dereferencing it to avoid kernel panic.
This happens when using usb to ethernet adapter.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Gregory Herrero <gregory.herrero@intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
drivers/usb/dwc2/hcd_intr.c | 10 ++++++++++
1 file changed, 10 insertions(+)
(limited to 'drivers/usb')
diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
index 6ea8eb6899f4..4cc95df4262d 100644
--- a/drivers/usb/dwc2/hcd_intr.c
+++ b/drivers/usb/dwc2/hcd_intr.c
@@ -1208,6 +1208,16 @@ static void dwc2_hc_nak_intr(struct dwc2_hsotg *hsotg,
struct dwc2_host_chan *chan, int chnum,
struct dwc2_qtd *qtd)
{
+ if (!qtd) {
+ dev_dbg(hsotg->dev, "%s: qtd is NULL\n", __func__);
+ return;
+ }
+
+ if (!qtd->urb) {
+ dev_dbg(hsotg->dev, "%s: qtd->urb is NULL\n", __func__);
+ return;
+ }
+
if (dbg_hc(chan))
dev_vdbg(hsotg->dev, "--Host Channel %d Interrupt: NAK Received--\n",
chnum);
--
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