linux-kernel - Re: [RFC] xfrm: convert alg_key to flexible array member

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Date:   Wed, 25 May 2022 08:15:54 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     netdev@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "David S. Miller" <davem@...emloft.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] xfrm: convert alg_key to flexible array member

On Tue, May 24, 2022 at 01:47:40PM -0700, Stephen Hemminger wrote:
> Iproute2 build generates a warning when built with gcc-12.
> This is because the alg_key in xfrm.h API has zero size
> array element instead of flexible array.
> 
>     CC       xfrm_state.o
> In function ‘xfrm_algo_parse’,
>     inlined from ‘xfrm_state_modify.constprop’ at xfrm_state.c:573:5:
> xfrm_state.c:162:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
>   162 |                         buf[j] = val;
>       |                         ~~~~~~~^~~~~
> 
> This patch convert the alg_key into flexible array member.
> There are other zero size arrays here that should be converted as
> well.
> 
> This patch is RFC only since it is only compile tested and
> passes trivial iproute2 tests.
> 
> Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
> ---
>  include/uapi/linux/xfrm.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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