From 1b1943b755c46d696cd8faa7c7bda350495cce13 Mon Sep 17 00:00:00 2001 From: Vijayavardhan Vennapusa Date: Wed, 4 Apr 2018 11:02:28 +0530 Subject: [PATCH] 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 NULL. Change-Id: I4f1deb9d764b8c0bd1d7837cbc43a2933167f568 Signed-off-by: Vijayavardhan Vennapusa --- drivers/usb/gadget/function/f_accessory.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/gadget/function/f_accessory.c b/drivers/usb/gadget/function/f_accessory.c index a412f024d834..61dfceb336d6 100644 --- a/drivers/usb/gadget/function/f_accessory.c +++ b/drivers/usb/gadget/function/f_accessory.c @@ -887,6 +887,12 @@ int acc_ctrlrequest(struct usb_composite_dev *cdev, 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",