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From: Eric Sunshine <sunshine@sunshineco.com>
To: Jeff King <peff@peff.net>
Cc: Git List <git@vger.kernel.org>
Subject: Re: [PATCH 04/18] add helpers for allocating flex-array structs
Date: Mon, 15 Feb 2016 20:47:30 -0500	[thread overview]
Message-ID: <CAPig+cQAU6y4VfGen0N6vNiDt+rjdcDM8YC+BF9HpvVj2WTUng@mail.gmail.com> (raw)
In-Reply-To: <20160215215054.GD10287@sigill.intra.peff.net>

On Mon, Feb 15, 2016 at 4:50 PM, Jeff King <peff@peff.net> wrote:
> Allocating a struct with a flex array is pretty simple in
> practice: you over-allocate the struct, then copy some data
> into the over-allocation. But it can be a slight pain to
> make sure you're allocating and copying the right amounts.
>
> This patch adds a few helpers to turn simple cases of into a

Grammo: "cases of into"

> one-liner that properly checks for overflow. See the
> embedded documentation for details.
> [...]
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> diff --git a/git-compat-util.h b/git-compat-util.h
> @@ -782,6 +782,68 @@ extern FILE *fopen_for_writing(const char *path);
> + *   struct foo *f;
> + *   FLEX_ALLOC_STR(f, name, src);
> + *
> + * and "name" will point to a block of memory after the struct, which will be
> + * freed along with the struct (but the pointer can be repoined anywhere).

"repoined"?

> + * The *_STR variants accept a string parameter rather than a ptr/len
> + * combination.

  reply	other threads:[~2016-02-16  1:48 UTC|newest]

Thread overview: 93+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-15 21:45 [PATCH 0/18] hardening allocations against integer overflow Jeff King
2016-02-15 21:49 ` [PATCH 01/18] add helpers for detecting size_t overflow Jeff King
2016-02-15 21:49 ` [PATCH 02/18] tree-diff: catch integer overflow in combine_diff_path allocation Jeff King
2016-02-15 21:50 ` [PATCH 03/18] harden REALLOC_ARRAY and xcalloc against size_t overflow Jeff King
2016-02-15 21:50 ` [PATCH 04/18] add helpers for allocating flex-array structs Jeff King
2016-02-16  1:47   ` Eric Sunshine [this message]
2016-02-16  2:52     ` Jeff King
2016-02-15 21:51 ` [PATCH 05/18] convert trivial cases to ALLOC_ARRAY Jeff King
2016-02-16  4:22   ` Eric Sunshine
2016-02-16  4:23     ` Jeff King
2016-02-16  4:32       ` Eric Sunshine
2016-02-16  5:46         ` Jeff King
2016-02-15 21:52 ` [PATCH 06/18] use xmallocz to avoid size arithmetic Jeff King
2016-02-15 21:52 ` [PATCH 07/18] convert trivial cases to FLEX_ARRAY macros Jeff King
2016-02-16  2:17   ` Eric Sunshine
2016-02-16  3:15     ` Jeff King
2016-02-16  3:26       ` Jeff King
2016-02-16  3:36         ` Jeff King
2016-02-16  4:18           ` Eric Sunshine
2016-02-16  4:22             ` Jeff King
2016-02-16  4:10       ` Eric Sunshine
2016-02-15 21:53 ` [PATCH 08/18] use st_add and st_mult for allocation size computation Jeff King
2016-02-16  5:47   ` Eric Sunshine
2016-02-15 21:53 ` [PATCH 09/18] write_untracked_extension: use FLEX_ALLOC helper Jeff King
2016-02-15 21:54 ` [PATCH 10/18] fast-import: simplify allocation in start_packfile Jeff King
2016-02-15 21:54 ` [PATCH 11/18] fetch-pack: simplify add_sought_entry Jeff King
2016-02-15 21:55 ` [PATCH 12/18] test-path-utils: fix normalize_path_copy output buffer size Jeff King
2016-02-15 21:56 ` [PATCH 13/18] sequencer: simplify memory allocation of get_message Jeff King
2016-02-16  6:05   ` Eric Sunshine
2016-02-15 21:56 ` [PATCH 14/18] git-compat-util: drop mempcpy compat code Jeff King
2016-02-16  6:05   ` Eric Sunshine
2016-02-15 21:56 ` [PATCH 15/18] transport_anonymize_url: use xstrfmt Jeff King
2016-02-15 21:56 ` [PATCH 16/18] diff_populate_gitlink: use a strbuf Jeff King
2016-02-15 21:57 ` [PATCH 17/18] convert ewah/bitmap code to use xmalloc Jeff King
2016-02-15 21:57 ` [PATCH 18/18] ewah: convert to REALLOC_ARRAY, etc Jeff King
2016-02-15 22:02 ` [PATCH 0/18] hardening allocations against integer overflow Jeff King
2016-02-19 11:19 ` [PATCH v2 0/21] " Jeff King
2016-02-19 11:21   ` [PATCH 01/21] reflog_expire_cfg: NUL-terminate pattern field Jeff King
2016-02-19 11:21   ` [PATCH 02/21] add helpers for detecting size_t overflow Jeff King
2016-02-19 11:21   ` [PATCH 03/21] tree-diff: catch integer overflow in combine_diff_path allocation Jeff King
2016-02-19 11:22   ` [PATCH 04/21] harden REALLOC_ARRAY and xcalloc against size_t overflow Jeff King
2016-02-20 21:32     ` René Scharfe
2016-02-21 23:30       ` Jeff King
2016-02-19 11:22   ` [PATCH 05/21] add helpers for allocating flex-array structs Jeff King
2016-02-19 11:23   ` [PATCH 06/21] convert manual allocations to argv_array Jeff King
2016-02-20  8:07     ` Eric Sunshine
2016-02-20  8:10       ` Jeff King
2016-02-20  8:29         ` Eric Sunshine
2016-02-20  8:34           ` Jeff King
2016-02-20  8:39             ` Eric Sunshine
2016-02-20  8:57               ` Jeff King
2016-02-20  9:04                 ` Eric Sunshine
2016-02-19 11:23   ` [PATCH 07/21] convert trivial cases to ALLOC_ARRAY Jeff King
2016-02-19 11:23   ` [PATCH 08/21] use xmallocz to avoid size arithmetic Jeff King
2016-02-19 11:23   ` [PATCH 09/21] convert trivial cases to FLEX_ARRAY macros Jeff King
2016-02-19 11:23   ` [PATCH 10/21] use st_add and st_mult for allocation size computation Jeff King
2016-02-19 11:24   ` [PATCH 11/21] prepare_{git,shell}_cmd: use argv_array Jeff King
2016-02-19 11:24   ` [PATCH 12/21] write_untracked_extension: use FLEX_ALLOC helper Jeff King
2016-02-19 11:24   ` [PATCH 13/21] fast-import: simplify allocation in start_packfile Jeff King
2016-02-19 17:48     ` Junio C Hamano
2016-02-19 19:12       ` Jeff King
2016-02-19 11:24   ` [PATCH 14/21] fetch-pack: simplify add_sought_entry Jeff King
2016-02-19 11:24   ` [PATCH 15/21] test-path-utils: fix normalize_path_copy output buffer size Jeff King
2016-02-19 11:25   ` [PATCH 16/21] sequencer: simplify memory allocation of get_message Jeff King
2016-02-19 11:25   ` [PATCH 17/21] git-compat-util: drop mempcpy compat code Jeff King
2016-02-19 11:25   ` [PATCH 18/21] transport_anonymize_url: use xstrfmt Jeff King
2016-02-19 11:25   ` [PATCH 19/21] diff_populate_gitlink: use a strbuf Jeff King
2016-02-19 11:25   ` [PATCH 20/21] convert ewah/bitmap code to use xmalloc Jeff King
2016-02-19 11:25   ` [PATCH 21/21] ewah: convert to REALLOC_ARRAY, etc Jeff King
2016-02-22 22:41   ` [PATCH v3 0/22] hardening allocations against integer overflow Jeff King
2016-02-22 22:43     ` [PATCH v3 01/22] reflog_expire_cfg: NUL-terminate pattern field Jeff King
2016-02-22 22:43     ` [PATCH v3 02/22] add helpers for detecting size_t overflow Jeff King
2016-02-22 22:43     ` [PATCH v3 03/22] tree-diff: catch integer overflow in combine_diff_path allocation Jeff King
2016-02-22 22:43     ` [PATCH v3 04/22] harden REALLOC_ARRAY and xcalloc against size_t overflow Jeff King
2016-02-22 22:43     ` [PATCH v3 05/22] add helpers for allocating flex-array structs Jeff King
2016-02-22 22:44     ` [PATCH v3 06/22] argv-array: add detach function Jeff King
2016-02-22 22:44     ` [PATCH v3 07/22] convert manual allocations to argv_array Jeff King
2016-02-22 22:44     ` [PATCH v3 08/22] convert trivial cases to ALLOC_ARRAY Jeff King
2016-02-22 22:44     ` [PATCH v3 09/22] use xmallocz to avoid size arithmetic Jeff King
2016-02-22 22:44     ` [PATCH v3 10/22] convert trivial cases to FLEX_ARRAY macros Jeff King
2016-02-22 22:44     ` [PATCH v3 11/22] use st_add and st_mult for allocation size computation Jeff King
2016-02-22 22:44     ` [PATCH v3 12/22] prepare_{git,shell}_cmd: use argv_array Jeff King
2016-02-22 22:44     ` [PATCH v3 13/22] write_untracked_extension: use FLEX_ALLOC helper Jeff King
2016-02-22 22:44     ` [PATCH v3 14/22] fast-import: simplify allocation in start_packfile Jeff King
2016-02-22 22:44     ` [PATCH v3 15/22] fetch-pack: simplify add_sought_entry Jeff King
2016-02-22 22:44     ` [PATCH v3 16/22] test-path-utils: fix normalize_path_copy output buffer size Jeff King
2016-02-22 22:44     ` [PATCH v3 17/22] sequencer: simplify memory allocation of get_message Jeff King
2016-02-22 22:45     ` [PATCH v3 18/22] git-compat-util: drop mempcpy compat code Jeff King
2016-02-22 22:45     ` [PATCH v3 19/22] transport_anonymize_url: use xstrfmt Jeff King
2016-02-22 22:45     ` [PATCH v3 20/22] diff_populate_gitlink: use a strbuf Jeff King
2016-02-22 22:45     ` [PATCH v3 21/22] convert ewah/bitmap code to use xmalloc Jeff King
2016-02-22 22:45     ` [PATCH v3 22/22] ewah: convert to REALLOC_ARRAY, etc Jeff King
2016-02-22 23:08     ` [PATCH v3 0/22] hardening allocations against integer overflow Junio C Hamano

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