From 865835fa441fcabc65251f14280df3055fe82d0f Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Fri, 15 Apr 2011 20:37:06 +0200 Subject: [PATCH] usb/dummy_hcd: don't probe for udc if hcd failed the_controller is allocated in dummy_hcd_probe() and is NULL if the allocation failed. The probe function of the udc driver is dereferencing this pointer and fault. Alan Stern suggested to abort the dummy_hcd driver probing so the module is not loaded. The is abort-on-error has been also added to the udc driver. Signed-off-by: Sebastian Andrzej Siewior Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/dummy_hcd.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c index 3214ca375d64..61ff927928ab 100644 --- a/drivers/usb/gadget/dummy_hcd.c +++ b/drivers/usb/gadget/dummy_hcd.c @@ -892,10 +892,11 @@ static int dummy_udc_probe (struct platform_device *pdev) return rc; } - platform_set_drvdata (pdev, dum); rc = device_create_file (&dum->gadget.dev, &dev_attr_function); if (rc < 0) device_unregister (&dum->gadget.dev); + else + platform_set_drvdata(pdev, dum); return rc; } @@ -1995,11 +1996,29 @@ static int __init init (void) retval = platform_device_add(the_hcd_pdev); if (retval < 0) goto err_add_hcd; + if (!the_controller) { + /* + * The hcd was added successfully but its probe function failed + * for some reason. + */ + retval = -EINVAL; + goto err_add_udc; + } retval = platform_device_add(the_udc_pdev); if (retval < 0) goto err_add_udc; + if (!platform_get_drvdata(the_udc_pdev)) { + /* + * The udc was added successfully but its probe function failed + * for some reason. + */ + retval = -EINVAL; + goto err_probe_udc; + } return retval; +err_probe_udc: + platform_device_del(the_udc_pdev); err_add_udc: platform_device_del(the_hcd_pdev); err_add_hcd: -- 2.20.1