linux-kernel - [BUG] video: fbdev: broadsheetfb: Possible null function pointers

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Message-ID: <cb43741a-83af-0b55-f53b-489bf7cb8b61@gmail.com>
Date:   Thu, 26 Jul 2018 22:17:44 +0800
From:   bai <baijiaju1990@...il.com>
To:     b.zolnierkie@...sung.com
Cc:     dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [BUG] video: fbdev: broadsheetfb: Possible null function pointers

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