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 <bigeasy@xxxxxxxxxxxxx>
---
drivers/usb/gadget/dummy_hcd.c | 21 ++++++++++++++++++++-
1 files changed, 20 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
index 3214ca3..61ff927 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:
--
1.7.4
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