linux-kernel - Re: [PATCH] ipv6: ioam: Replace 0-length array with flexible array

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Message-Id: <167306281651.4583.5175258501631877655.git-patchwork-notify@kernel.org>
Date:   Sat, 07 Jan 2023 03:40:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     davem@...emloft.net, kuba@...nel.org, justin.iurman@...ege.be,
        edumazet@...gle.com, pabeni@...hat.com, gustavoars@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ipv6: ioam: Replace 0-length array with flexible array

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <kuba@...nel.org>:

On Thu,  5 Jan 2023 14:21:16 -0800 you wrote:
> Zero-length arrays are deprecated[1]. Replace struct ioam6_trace_hdr's
> "data" 0-length array with a flexible array. Detected with GCC 13,
> using -fstrict-flex-arrays=3:
> 
> net/ipv6/ioam6_iptunnel.c: In function 'ioam6_build_state':
> net/ipv6/ioam6_iptunnel.c:194:37: warning: array subscript <unknown> is outside array bounds of '__u8[0]' {aka 'unsigned char[]'} [-Warray-bounds=]
>   194 |                 tuninfo->traceh.data[trace->remlen * 4] = IPV6_TLV_PADN;
>       |                 ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
> In file included from include/linux/ioam6.h:11,
>                  from net/ipv6/ioam6_iptunnel.c:13:
> include/uapi/linux/ioam6.h:130:17: note: while referencing 'data'
>   130 |         __u8    data[0];
>       |                 ^~~~
> 
> [...]

Here is the summary with links:
  - ipv6: ioam: Replace 0-length array with flexible array
    https://git.kernel.org/netdev/net-next/c/0b5dfa35da03

You are awesome, thank you!
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