linux-kernel - gpu/drm/dp/drm_dp.c:59:27: warning: array subscript 10 is outside array bounds of 'const u8[6]'

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Date:   Thu, 24 Feb 2022 20:01:10 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     dri-devel@...ts.freedesktop.org,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>
Cc:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Lyude Paul <lyude@...hat.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Jani Nikula <jani.nikula@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        Douglas Anderson <dianders@...omium.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        lkft-triage@...ts.linaro.org
Subject: gpu/drm/dp/drm_dp.c:59:27: warning: array subscript 10 is outside
 array bounds of 'const u8[6]'

[Please ignore this email if it is already reported]

Linux next-20220223 arch riscv build warnings noticed.
Build configs:
  - riscv-gcc-9-defconfig
  - riscv-gcc-9-defconfig
  - riscv-gcc-10-defconfig
  - riscv-gcc-11-defconfig

metadata:
  git_ref: master
  git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
  git_sha: d4a0ae62a277377de396850ed4b709b6bd9b7326
  git_describe: next-20220223
  arch: riscv
  toolchain: gcc-11

Build warnings:
-----------
drivers/gpu/drm/dp/drm_dp.c: In function
'drm_dp_get_adjust_request_post_cursor':
drivers/gpu/drm/dp/drm_dp.c:59:27: warning: array subscript 10 is
outside array bounds of 'const u8[6]' {aka 'const unsigned char[6]'}
[-Warray-bounds]
   59 |         return link_status[r - DP_LANE0_1_STATUS];
      |                ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/dp/drm_dp.c:210:51: note: while referencing 'link_status'
  210 | u8 drm_dp_get_adjust_request_post_cursor(const u8
link_status[DP_LINK_STATUS_SIZE],
      |
~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[1]: Target '__all' not remade because of errors.

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Steps to reproduce:
------------------
# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake

tuxmake --runtime podman --target-arch riscv --toolchain gcc-11
--kconfig defconfig

--
Linaro LKFT
https://lkft.linaro.org

[1] https://builds.tuxbuild.com/25XO99nwfQgKrWKz4yfBPYw0wyU/