linux-kernel - Re: [PATCH 2/2] lib/bpf hashmap: fixes to hashmap_

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Message-ID: <CAEf4BzYJanGO+XrTBQoEzGoB_D6xQYYm9tT70+Kie4hyKCxhjQ@mail.gmail.com>
Date:   Wed, 6 May 2020 14:36:23 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] lib/bpf hashmap: fixes to hashmap__clear

On Wed, May 6, 2020 at 1:55 PM Ian Rogers <irogers@...gle.com> wrote:
>
> hashmap_find_entry assumes that if buckets is NULL then there are no
> entries. NULL the buckets in clear to ensure this.
> Free hashmap entries and not just the bucket array.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---

This is already fixed in bpf-next ([0]). Seems to be 1-to-1 character
by character :)

  [0] https://patchwork.ozlabs.org/project/netdev/patch/20200429012111.277390-5-andriin@fb.com/

>  tools/lib/bpf/hashmap.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tools/lib/bpf/hashmap.c b/tools/lib/bpf/hashmap.c
> index 54c30c802070..1a1bca1ff5cd 100644
> --- a/tools/lib/bpf/hashmap.c
> +++ b/tools/lib/bpf/hashmap.c
> @@ -59,7 +59,13 @@ struct hashmap *hashmap__new(hashmap_hash_fn hash_fn,
>
>  void hashmap__clear(struct hashmap *map)
>  {
> +       struct hashmap_entry *cur, *tmp;
> +       size_t bkt;
> +
> +       hashmap__for_each_entry_safe(map, cur, tmp, bkt)
> +               free(cur);
>         free(map->buckets);
> +       map->buckets = NULL;
>         map->cap = map->cap_bits = map->sz = 0;
>  }
>
> --
> 2.26.2.526.g744177e7f7-goog
>