usb: gadget: pch_udc: Check if driver is present before calling ->setup()

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Since we have a separate routine for VBUS sense, the interrupt may occur
before gadget driver is present. Hence, ->setup() call may oops the kernel:

[   55.245843] BUG: kernel NULL pointer dereference, address: 00000010
...
[   55.245843] EIP: pch_udc_isr.cold+0x162/0x33f
...
[   55.245843]  <IRQ>
[   55.245843]  ? pch_udc_svc_data_out+0x160/0x160

Check if driver is present before calling ->setup().

Fixes: f646cf9452 ("USB device driver of Topcliff PCH")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210323153626.54908-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Andy Shevchenko 2021-03-23 17:36:21 +02:00 • committed by Greg Kroah-Hartman

parent 91356fed6a

commit fbdbbe6d3e

1 changed files with 18 additions and 10 deletions

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drivers/usb/gadget/udc/pch_udc.c

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