Re: [PATCH v5 01/14] clk: microchip: mpfs: fix clk_cfg array bounds violation

Stephen Boyd
2022-09-29T00:30:37Z

Quoting Conor Dooley (2022-09-09 05:31:10)
> There is an array bounds violation present during clock registration,
> triggered by current code by only specific toolchains. This seems to
> fail gracefully in v6.0-rc1, using a toolchain build from the riscv-
> gnu-toolchain repo and with clang-15, and life carries on. While
> converting the driver to use standard clock structs/ops, kernel panics
> were seen during boot when built with clang-15:
>
[...]
>
> If parent is RTCREF, so the macro becomes: &mpfs_cfg_clks[33].cfg.hw
> which is well beyond the end of the array. Amazingly, builds with GCC
> 11.1 see no problem here, booting correctly and hooking the parent up
> etc. Builds with clang-15 do not, with the above panic.
>
> Change the macro to use specific offsets depending on the parent rather
> than the dt-binding's clock IDs.
>
> Fixes: 1c6a7ea32b8c ("clk: microchip: mpfs: add RTCREF clock control")
> CC: Nathan Chancellor <nathan@kernel.org>
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---

I'll merge this patch over to clk-fixes as well.