Subject: Re: [PATCH] net: ipv6: rpl_iptunnel: Replace 0-length arrays with flexible arrays

From: [email-masked]
Date: Sat, 07 Jan 2023 03:40:16 +0000

Hello:

This patch was applied to netdev/net-next.git (master)
by Jakub Kicinski <[email-masked]>:

On Thu,  5 Jan 2023 14:15:37 -0800 you wrote:
> Zero-length arrays are deprecated[1]. Replace struct ipv6_rpl_sr_hdr's
> "segments" union of 0-length arrays with flexible arrays. Detected with
> GCC 13, using -fstrict-flex-arrays=3:
> 
> In function 'rpl_validate_srh',
>     inlined from 'rpl_build_state' at ../net/ipv6/rpl_iptunnel.c:96:7:
> ../net/ipv6/rpl_iptunnel.c:60:28: warning: array subscript <unknown> is outside array bounds of 'struct in6_addr[0]' [-Warray-bounds=]
>    60 |         if (ipv6_addr_type(&srh->rpl_segaddr[srh->segments_left - 1]) &
>       |                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from ../include/net/rpl.h:12,
>                  from ../net/ipv6/rpl_iptunnel.c:13:
> ../include/uapi/linux/rpl.h: In function 'rpl_build_state':
> ../include/uapi/linux/rpl.h:40:33: note: while referencing 'addr'
>    40 |                 struct in6_addr addr[0];
>       |                                 ^~~~
> 
> [...]

Here is the summary with links:
  - net: ipv6: rpl_iptunnel: Replace 0-length arrays with flexible arrays
    https://git.kernel.org/netdev/net-next/c/e8d283b6cf0e

You are awesome, thank you!
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