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

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Message-Id: <1426894852-4256-1-git-send-email-Badhri@google.com>
Date:	Fri, 20 Mar 2015 16:40:52 -0700
From:	Badhri Jagan Sridharan <badhri@...gle.com>
To:	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Badhri Jagan Sridharan <Badhri@...gle.com>
Subject: [PATCH] usb: gadget: Check for NULL pointer in disconnect

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@...gle.com>
---
 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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