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

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Message-ID: <CAP-5=fW97DB0CTLN=5iKPUF_tJW-yZgC+jiikdU0goSD_ADYkQ@mail.gmail.com>
Date:   Wed, 6 May 2020 14:53:41 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.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 2:36 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> 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/

Thanks!
Ian

> >  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
> >