ANDROID: USB: f_accessory: Check dev pointer before decoding ctrl request

In case of poweroff charging mode, accessory function instance
is not created and due to this, _acc_dev will be NULL. If target
is connected to Accessory dock in poweroff charging mode, there
is a chance dev pointer is accessed, which is NULL. Hence add a
check before processing control request and return error if it is

Bug: 141002587
Change-Id: I4f1deb9d764b8c0bd1d7837cbc43a2933167f568
Signed-off-by: Vijayavardhan Vennapusa <>
Signed-off-by: Jack Pham <>
Signed-off-by: Giuliano Procida <>
diff --git a/drivers/usb/gadget/function/f_accessory.c b/drivers/usb/gadget/function/f_accessory.c
index 3e0b8b5..de1c7ce 100644
--- a/drivers/usb/gadget/function/f_accessory.c
+++ b/drivers/usb/gadget/function/f_accessory.c
@@ -843,6 +843,12 @@
 	u16	w_length = le16_to_cpu(ctrl->wLength);
 	unsigned long flags;
+	/*
+	 * If instance is not created which is the case in power off charging
+	 * mode, dev will be NULL. Hence return error if it is the case.
+	 */
+	if (!dev)
+		return -ENODEV;
 	printk(KERN_INFO "acc_ctrlrequest "
 			"%02x.%02x v%04x i%04x l%u\n",