[BUG] video: fbdev: broadsheetfb: Possible null function pointers

From: bai
Date: Thu Jul 26 2018 - 10:17:49 EST

In Linux-4.16, drivers/video/fbdev/broadsheetfb.c,

158. static void broadsheet_mmio_send_cmdargs(...) {
163.ÂÂÂÂ par->board->mmio_write(...);
166.ÂÂÂÂ par->board->mmio_write(...);
167. }

For x86 kernel configuration, I find that there is no assignment of the function pointer ".mmio_write" in the kernel code.
So calling the function pointer in lines 163 and 166 may cause a null pointer dereference.

In this file, there are many calls to this function pointer...

Best wishes,
Jia-Ju Bai