[PATCH] usb: dwc3: gadget: Check for NULL descriptor

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The function driver may try to enable an unconfigured endpoint. This
check make sure that we do not attempt to access a NULL descriptor and
crash.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Thinh Nguyen <thinhn@xxxxxxxxxxxx>
---
 drivers/usb/dwc3/gadget.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 7f97856e6b20..00f8f079bbf2 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -619,6 +619,9 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, unsigned int action)
 	u32			reg;
 	int			ret;
 
+	if (!desc)
+		return -EINVAL;
+
 	if (!(dep->flags & DWC3_EP_ENABLED)) {
 		ret = dwc3_gadget_start_config(dep);
 		if (ret)
-- 
2.11.0




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