Potential NULL pointer deference in spi

[Yizhuo Zhai]

Hi All:

drivers/spi/spi.c:

The function to_spi_device() could return NULL, but some callers
in this file does not check the return value while directly dereference
it, which seems potentially unsafe.

Such callers include spidev_release(),  spi_dev_check(),
driver_override_store(), etc.


-- 
Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside