usb: gadget: pch_udc: Check if driver is present before calling ->setup()
[ Upstream commit fbdbbe6d3ee502b3bdeb4f255196bb45003614be ]
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: f646cf94520e ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
1 file changed