Re: [PATCH] resolve_btfids: Fix the --fatal_warnings exit status

[Ihor Solodrai <ihor.solodrai@linux.dev>]

On 10/8/26 8:03 AM, Petr Pavlu wrote:
> The resolve_btfids --fatal_warnings option is intended to make the tool
> exit with a non-zero status if any warnings are reported. main()
> initializes err to -1 and uses 'goto out' to return this status when
> a sub-operation fails. If no error occurs,
> 'if (!(fatal_warnings && warnings)) err = 0;' modifies the final status
> depending on whether any warnings have been reported.
> 
> Commit 522397d05e7d ("resolve_btfids: Change in-place update with raw
> binary output") broke this logic by assigning the return values of newly
> added sub-operations to err. As a result, successful sub-operations
> overwrite the initial err value of -1 with 0, causing the tool to exit
> successfully even when --fatal_warnings is enabled and warnings have been
> reported.
> 
> Fix the issue by setting the final value of err unconditionally, so the
> code doesn't depend on its previous value.
> 
> Fixes: 522397d05e7d ("resolve_btfids: Change in-place update with raw binary output")
> Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>

Acked-by: Ihor Solodrai <ihor.solodrai@linux.dev>

Thanks!

> ---
>  tools/bpf/resolve_btfids/main.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/tools/bpf/resolve_btfids/main.c b/tools/bpf/resolve_btfids/main.c
> index 37d7e7224207..2a93517ca9ec 100644
> --- a/tools/bpf/resolve_btfids/main.c
> +++ b/tools/bpf/resolve_btfids/main.c
> @@ -1842,8 +1842,7 @@ int main(int argc, const char **argv)
>  			goto out;
>  	}
>  
> -	if (!(fatal_warnings && warnings))
> -		err = 0;
> +	err = fatal_warnings && warnings ? -1 : 0;
>  out:
>  	btf__free(obj.base_btf);
>  	btf__free(obj.btf);
> 
> ---
> base-commit: a90ee4305c4a5df72c11b31dacfdc76e00fcf78a
> change-id: 20261008-resolve_btfids-warnings-a356edc7a5c6