Messages in this thread | | | From | Bartlomiej Zolnierkiewicz <> | Subject | Re: [BUG] video: fbdev: broadsheetfb: Possible null function pointers | Date | Thu, 26 Jul 2018 16:34:53 +0200 |
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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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