linux-kernel - Re: [PATCH RESEND] ASoC: Intel: Skylake: Replace zero-length array with flexible-array

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Message-ID: <d973f704-539e-eac8-122f-52f6b5d0e123@intel.com>
Date:   Mon, 11 May 2020 20:17:08 +0200
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] ASoC: Intel: Skylake: Replace zero-length array
 with flexible-array

On 2020-05-11 7:46 PM, Gustavo A. R. Silva wrote:
> The current codebase makes use of the zero-length array language
> extension to the C90 standard, but the preferred mechanism to declare
> variable-length types such as these ones is a flexible array member[1][2],
> introduced in C99:
> 
> struct foo {
>          int stuff;
>          struct boo array[];
> };
> 
> By making use of the mechanism above, we will get a compiler warning
> in case the flexible array does not occur last in the structure, which
> will help us prevent some kind of undefined behavior bugs from being
> inadvertently introduced[3] to the codebase from now on.
> 
> Also, notice that, dynamic memory allocations won't be affected by
> this change:
> 
> "Flexible array members have incomplete type, and so the sizeof operator
> may not be applied. As a quirk of the original implementation of
> zero-length arrays, sizeof evaluates to zero."[1]
> 
> sizeof(flexible-array-member) triggers a warning because flexible array
> members have incomplete type[1]. There are some instances of code in
> which the sizeof operator is being incorrectly/erroneously applied to
> zero-length arrays and the result is zero. Such instances may be hiding
> some bugs. So, this work (flexible-array member conversions) will also
> help to get completely rid of those sorts of issues.
> 
> This issue was found with the help of Coccinelle.
> 
> [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> [2] https://github.com/KSPP/linux/issues/21
> [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
> 
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>   sound/soc/intel/atom/sst-atom-controls.h |    2 +-
>   sound/soc/intel/skylake/skl-i2s.h        |    2 +-
>   sound/soc/intel/skylake/skl-topology.h   |    4 ++--
>   sound/soc/intel/skylake/skl.h            |    2 +-
>   4 files changed, 5 insertions(+), 5 deletions(-)
> 

Acked-by: Cezary Rojewski <cezary.rojewski@...el.com>

Thanks,
Czarek