On Thursday, July 26, 2018 10:17:44 PM bai wrote:
> 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...
This is a platform driver and it won't be used on x86 (actually it is
used only by single ARM PXA board). The dependency for FB_BROADSHEET
in Kconfig file could be improved to i.e.
depends on FB && (ARCH_PXA || COMPILE_TEST)
but there is no bug there.
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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