In Linux-4.16, drivers/video/fbdev/broadsheetfb.c,
158. static void broadsheet_mmio_send_cmdargs(...) {
......
163. par->board->mmio_write(...);
......
166. 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
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