[PATCH] usb: gadget: Check for NULL pointer in disconnect

[Badhri Jagan Sridharan]

Added a safety net to make sure that
composite_disconnect does not end up disconneting
a NULL device. Prevents NULL pointer crash.

Signed-off-by: Badhri Jagan Sridharan <Badhri@xxxxxxxxxx>
---
 drivers/usb/gadget/composite.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 13adfd1..90b37bd 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1823,6 +1823,11 @@ void composite_disconnect(struct usb_gadget *gadget)
 	struct usb_composite_dev	*cdev = get_gadget_data(gadget);
 	unsigned long			flags;
 
+	if (!cdev) {
+		WARN(1, "Trying to disconnect a NULL composite device\n");
+		return;
+	}
+
 	/* REVISIT:  should we have config and device level
 	 * disconnect callbacks?
 	 */
-- 
2.2.0.rc0.207.ga3a616c

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