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usb: gadget: f_rndis: Avoid to use ERROR macro if cdev can be null 

The udc_irq service runs the isr_tr_complete_handler which in turn
"nukes" the endpoints, including a call to rndis_response_complete,
if appropriate. If the rndis_msg_parser fails here, an error will
be printed using a dev_err call (through the ERROR() macro).

However, if the usb cable was just disconnected the device (cdev)
might not be available and will be null. Since the dev_err macro will
dereference the cdev pointer we get a null pointer exception.

Reviewed-by: Radovan Lekanovic <radovan.lekanovic@sonymobile.com>
Signed-off-by: Truls Bengtsson <truls.bengtsson@sonymobile.com>
Signed-off-by: Oskar Andero <oskar.andero@sonymobile.com>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Truls Bengtsson 2013-03-20 14:02:25 +01:00 committed by Felipe Balbi
parent 7fa4cd1a78
commit 967baed40e
1 changed files with 1 additions and 2 deletions
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3
drivers/usb/gadget/f_rndis.c
View File

@ -447,14 +447,13 @@ static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_rndis *rndis = req->context;
struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
int status;
/* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
// spin_lock(&dev->lock);
status = rndis_msg_parser(rndis->config, (u8 *) req->buf);
if (status < 0)
ERROR(cdev, "RNDIS command error %d, %d/%d\n",
pr_err("RNDIS command error %d, %d/%d\n",
status, req->actual, req->length);
// spin_unlock(&dev->lock);
}