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From: Taylor Blau <me@ttaylorr.com>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org, Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 02/15] pack-bitmap: fix leak of haves/wants object lists
Date: Fri, 14 Feb 2020 16:15:52 -0800
Message-ID: <20200215001552.GE11400@syl.local> (raw)
In-Reply-To: <20200214182211.GB150965@coredump.intra.peff.net>

On Fri, Feb 14, 2020 at 01:22:11PM -0500, Jeff King wrote:
> When we do a bitmap-aware revision traversal, we create an object_list
> for each of the "haves" and "wants" tips. After creating the result
> bitmaps these are no longer needed or used, but we never free the list
> memory.
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  object.c      | 9 +++++++++
>  object.h      | 2 ++
>  pack-bitmap.c | 5 +++++
>  3 files changed, 16 insertions(+)
>
> diff --git a/object.c b/object.c
> index 142ef69399..4d11949b38 100644
> --- a/object.c
> +++ b/object.c
> @@ -307,6 +307,15 @@ int object_list_contains(struct object_list *list, struct object *obj)
>  	return 0;
>  }
>
> +void object_list_free(struct object_list **list)
> +{
> +	while (*list) {
> +		struct object_list *p = *list;
> +		*list = p->next;
> +		free(p);
> +	}
> +}

Hmm. I was going to write a comment saying more-or-less, "I think I'm
nitpicking here, but I'm not crazy about this as a 'while' loop". But,
when I wrote this as a 'for' loop instead, I wrote a use-after-free, and
then when I rid the code of that, it wasn't any more readable than the
version above.

>  /*
>   * A zero-length string to which object_array_entry::name can be
>   * initialized without requiring a malloc/free.
> diff --git a/object.h b/object.h
> index 25f5ab3d54..2dbabfca0a 100644
> --- a/object.h
> +++ b/object.h
> @@ -151,6 +151,8 @@ struct object_list *object_list_insert(struct object *item,
>
>  int object_list_contains(struct object_list *list, struct object *obj);
>
> +void object_list_free(struct object_list **list);
> +
>  /* Object array handling .. */
>  void add_object_array(struct object *obj, const char *name, struct object_array *array);
>  void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
> diff --git a/pack-bitmap.c b/pack-bitmap.c
> index 9ca356ee29..6c06099dc7 100644
> --- a/pack-bitmap.c
> +++ b/pack-bitmap.c
> @@ -787,10 +787,15 @@ struct bitmap_index *prepare_bitmap_walk(struct rev_info *revs)
>  	bitmap_git->result = wants_bitmap;
>  	bitmap_git->haves = haves_bitmap;
>
> +	object_list_free(&wants);
> +	object_list_free(&haves);
> +

Makes sense.

>  	return bitmap_git;
>
>  cleanup:
>  	free_bitmap_index(bitmap_git);
> +	object_list_free(&wants);
> +	object_list_free(&haves);

Ditto.

>  	return NULL;
>  }
>
> --
> 2.25.0.796.gcc29325708

Thanks,
Taylor

  reply index

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13  2:15 [PATCH 0/13] combining object filters and bitmaps Jeff King
2020-02-13  2:16 ` [PATCH 01/13] pack-bitmap: factor out type iterator initialization Jeff King
2020-02-13 17:45   ` Junio C Hamano
2020-02-13  2:16 ` [PATCH 02/13] pack-bitmap: fix leak of haves/wants object lists Jeff King
2020-02-13 18:12   ` Junio C Hamano
2020-02-13  2:17 ` [PATCH 03/13] rev-list: fallback to non-bitmap traversal when filtering Jeff King
2020-02-13 18:19   ` Junio C Hamano
2020-02-13 18:40     ` Jeff King
2020-02-13  2:17 ` [PATCH 04/13] rev-list: consolidate bitmap-disabling options Jeff King
2020-02-13  2:18 ` [PATCH 05/13] rev-list: factor out bitmap-optimized routines Jeff King
2020-02-13 18:34   ` Junio C Hamano
2020-02-13  2:19 ` [PATCH 06/13] rev-list: make --count work with --objects Jeff King
2020-02-13 19:14   ` Junio C Hamano
2020-02-13 20:27     ` Jeff King
2020-02-13  2:20 ` [PATCH 07/13] rev-list: allow bitmaps when counting objects Jeff King
2020-02-13 21:47   ` Junio C Hamano
2020-02-13 22:27     ` Jeff King
2020-02-13  2:20 ` [PATCH 08/13] pack-bitmap: basic noop bitmap filter infrastructure Jeff King
2020-02-13  2:21 ` [PATCH 09/13] rev-list: use bitmap filters for traversal Jeff King
2020-02-13 22:22   ` Junio C Hamano
2020-02-13 22:34     ` Jeff King
2020-02-13  2:21 ` [PATCH 10/13] bitmap: add bitmap_unset() function Jeff King
2020-02-13  2:23 ` [PATCH 11/13] pack-bitmap: implement BLOB_NONE filtering Jeff King
2020-02-13  2:25 ` [PATCH 12/13] pack-bitmap: implement BLOB_LIMIT filtering Jeff King
2020-02-13 23:17   ` Junio C Hamano
2020-02-13  2:25 ` [PATCH 13/13] pack-objects: support filters with bitmaps Jeff King
2020-02-14 18:21 ` [PATCH v2 0/15] combining object filters and bitmaps Jeff King
2020-02-14 18:22   ` [PATCH v2 01/15] pack-bitmap: factor out type iterator initialization Jeff King
2020-02-15  0:10     ` Taylor Blau
2020-02-14 18:22   ` [PATCH v2 02/15] pack-bitmap: fix leak of haves/wants object lists Jeff King
2020-02-15  0:15     ` Taylor Blau [this message]
2020-02-15  6:46       ` Jeff King
2020-02-18 17:58     ` Derrick Stolee
2020-02-18 20:02       ` Jeff King
2020-02-14 18:22   ` [PATCH v2 03/15] rev-list: fallback to non-bitmap traversal when filtering Jeff King
2020-02-15  0:22     ` Taylor Blau
2020-02-14 18:22   ` [PATCH v2 04/15] pack-bitmap: refuse to do a bitmap traversal with pathspecs Jeff King
2020-02-14 19:03     ` Junio C Hamano
2020-02-14 20:51       ` Jeff King
2020-02-14 18:22   ` [PATCH v2 05/15] rev-list: factor out bitmap-optimized routines Jeff King
2020-02-15  0:35     ` Taylor Blau
2020-02-14 18:22   ` [PATCH v2 06/15] rev-list: make --count work with --objects Jeff King
2020-02-15  0:42     ` Taylor Blau
2020-02-15  6:48       ` Jeff King
2020-02-16 23:34         ` Junio C Hamano
2020-02-18  5:24           ` Jeff King
2020-02-18 17:28             ` Junio C Hamano
2020-02-18 19:55               ` Jeff King
2020-02-18 21:19                 ` Junio C Hamano
2020-02-18 21:23                   ` Jeff King
2020-02-18 18:05     ` Derrick Stolee
2020-02-18 19:59       ` Jeff King
2020-02-14 18:22   ` [PATCH v2 07/15] rev-list: allow bitmaps when counting objects Jeff King
2020-02-15  0:45     ` Taylor Blau
2020-02-15  6:55       ` Jeff King
2020-02-16 23:36         ` Junio C Hamano
2020-02-14 18:22   ` [PATCH v2 08/15] t5310: factor out bitmap traversal comparison Jeff King
2020-02-15  2:14     ` Taylor Blau
2020-02-15  7:00       ` Jeff King
2020-02-14 18:22   ` [PATCH v2 09/15] rev-list: allow commit-only bitmap traversals Jeff King
2020-02-18 18:18     ` Derrick Stolee
2020-02-18 20:05       ` Jeff King
2020-02-18 20:11         ` Derrick Stolee
2020-02-14 18:22   ` [PATCH v2 10/15] pack-bitmap: basic noop bitmap filter infrastructure Jeff King
2020-02-14 18:22   ` [PATCH v2 11/15] rev-list: use bitmap filters for traversal Jeff King
2020-02-14 18:22   ` [PATCH v2 12/15] bitmap: add bitmap_unset() function Jeff King
2020-02-14 18:22   ` [PATCH v2 13/15] pack-bitmap: implement BLOB_NONE filtering Jeff King
2020-02-18 19:26     ` Derrick Stolee
2020-02-18 19:36       ` Derrick Stolee
2020-02-18 20:30         ` Jeff King
2020-02-18 20:24       ` Jeff King
2020-02-14 18:22   ` [PATCH v2 14/15] pack-bitmap: implement BLOB_LIMIT filtering Jeff King
2020-02-14 18:22   ` [PATCH v2 15/15] pack-objects: support filters with bitmaps Jeff King

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