netdev - Re: [PATCH] tools/libbpf: signedness bug in btf_dedup_ref

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Date:   Thu, 28 Feb 2019 06:58:29 +0000
From:   Yonghong Song <yhs@...com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>
CC:     Daniel Borkmann <daniel@...earbox.net>, Martin Lau <kafai@...com>,
        "Song Liu" <songliubraving@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] tools/libbpf: signedness bug in btf_dedup_ref_type()



On 2/27/19 9:46 PM, Dan Carpenter wrote:
> The "ref_type_id" variable needs to be signed for the error handling
> to work.
> 
> Fixes: d5caef5b5655 ("btf: add BTF types deduplication algorithm")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> This goes through the BPF tree probably, although it does apply to
> net-next.
> 
>   tools/lib/bpf/btf.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/lib/bpf/btf.c b/tools/lib/bpf/btf.c
> index 68b50e9bbde1..8faed5386124 100644
> --- a/tools/lib/bpf/btf.c
> +++ b/tools/lib/bpf/btf.c
> @@ -2326,7 +2326,8 @@ static int btf_dedup_ref_type(struct btf_dedup *d, __u32 type_id)
>   	struct btf_type *t, *cand;
>   	/* if we don't find equivalent type, then we are representative type */
>   	__u32 new_id = type_id;
> -	__u32 h, ref_type_id;
> +	__u32 h; > +	int ref_type_id;

nit. Maybe you can change to
	int ref_type_id;
	__u32 h;
to maintain kernel declaration reverse christmas tree convention?

>   
>   	if (d->map[type_id] == BTF_IN_PROGRESS_ID)
>   		return -ELOOP;
>