linux-kernel - Re: Build regressions/improvements in v6.2-rc4

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Date:   Mon, 16 Jan 2023 10:50:33 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Build regressions/improvements in v6.2-rc4

On Mon, Jan 16, 2023 at 01:29:24PM +0100, Geert Uytterhoeven wrote:
> Below is the list of build error/warning regressions/improvements in
> v6.2-rc4[1] compared to v6.1[2].
> 
...
>   + /kisskb/src/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c: error: array subscript 2 is above array bounds of 'u32[2]' {aka 'unsigned int[2]'} [-Werror=array-bounds]:  => 641:28
>   + /kisskb/src/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c: error: array subscript 3 is above array bounds of 'u32[2]' {aka 'unsigned int[2]'} [-Werror=array-bounds]:  => 641:28

Unless I am missing something, the code is

        for (i = fmt->mem_planes; i < fmt->comp_planes; i++)
                size += q_data->sizeimage[i];

and both mem_planes and comp_planes are <= 2. How does the compiler
calculate an error subscript of 2/3 ?

Guenter