From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: "René Scharfe" <l.s.r@web.de>
Cc: Junio C Hamano <gitster@pobox.com>,
Han-Wen Nienhuys via GitGitGadget <gitgitgadget@gmail.com>,
git@vger.kernel.org, Jeff King <peff@peff.net>,
Han-Wen Nienhuys <hanwen@google.com>,
Han-Wen Nienhuys <hanwenn@gmail.com>
Subject: Re: [PATCH v5 16/16] reftable: be more paranoid about 0-length memcpy calls
Date: Sun, 26 Dec 2021 22:07:38 +0100 [thread overview]
Message-ID: <211226.86pmpjf4xz.gmgdl@evledraar.gmail.com> (raw)
In-Reply-To: <e288fad3-8a83-448c-d701-47c56bc258e3@web.de>
On Sun, Dec 26 2021, René Scharfe wrote:
> Am 23.12.21 um 19:59 schrieb Junio C Hamano:
>> René Scharfe <l.s.r@web.de> writes:
>>
>>>>> @@ -569,7 +572,8 @@ static int reftable_obj_record_decode(void *rec, struct strbuf key,
>>>>> uint64_t last;
>>>>> int j;
>>>>> r->hash_prefix = reftable_malloc(key.len);
>>>>> - memcpy(r->hash_prefix, key.buf, key.len);
>>>>> + if (key.len)
>>>>> + memcpy(r->hash_prefix, key.buf, key.len);
>>>>> r->hash_prefix_len = key.len;
>>>>>
>>>>> if (val_type == 0) {
>>>>
>>>> I am not sure why any of these are needed.
>>>> ...
>>> I don't know about the first two, but in the third case dst (i.e.
>>> r->hash_prefix) might be NULL if key.len == 0, reftable_malloc is malloc
>>> (which it is, because reftable_set_alloc is never called) and malloc(0)
>>> returns NULL (which it might do according to
>>> https://www.man7.org/linux/man-pages/man3/malloc.3.html).
>>>
>>> malloc can return NULL on failure, too, of course, and none of the
>>> reftable_malloc callers check for that. That seems a bit too
>>> optimistic.
>>
>> Yeah, I agree that the real bug in this code is that the returned
>> value of malloc() is not checked. But checking if key.len is zero
>> before using memcpy() would not help fix it, or hide it. So I am
>> not sure if that is a counter-argument against "this check is
>> pointless".
>
> It's not -- I was just trying to find a scenario which would cause a
> Coverity warning that could be silenced by such a zero check.
>
> We can use xmalloc and xrealloc to handle allocation failures and to get
> valid pointers for zero-sized allocations, like in the patch below.
>
> I don't understand why reftable_set_alloc exists, though -- is there
> really a use case that requires changing the allocator at runtime?
I don't know why it's there, but I suppose it's for the same reason as
PCREv2's integration, whose rabbit hole starts at 513f2b0bbd4 (grep:
make PCRE2 aware of custom allocator, 2019-10-16).
I.e. for building it as part of git.git we can just replace
malloc()/free(), but for other uses as a general linkable library you'd
want to replace it at runtime.
next prev parent reply other threads:[~2021-12-26 21:10 UTC|newest]
Thread overview: 194+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 17:45 [PATCH 00/10] Reftable coverity fixes Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 01/10] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 02/10] reftable: fix resource leak in error path Han-Wen Nienhuys via GitGitGadget
2021-12-08 14:30 ` Derrick Stolee
2021-12-07 17:45 ` [PATCH 03/10] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 04/10] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 05/10] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 06/10] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 07/10] reftable: fix NULL derefs in error paths Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 08/10] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2021-12-08 14:32 ` Derrick Stolee
2021-12-07 17:45 ` [PATCH 09/10] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2021-12-07 17:45 ` [PATCH 10/10] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2021-12-07 21:56 ` Junio C Hamano
2021-12-08 2:15 ` Jeff King
2021-12-08 4:13 ` Junio C Hamano
2021-12-08 10:30 ` Han-Wen Nienhuys
2021-12-08 16:35 ` Junio C Hamano
2021-12-08 19:50 ` [PATCH] config.mak.dev: specify -std=gnu99 for gcc/clang Jeff King
2021-12-09 12:05 ` Ævar Arnfjörð Bjarmason
2021-12-10 8:56 ` Jeff King
[not found] ` <220113.86tue7vr6d.gmgdl@evledraar.gmail.com>
2022-01-14 1:38 ` v2.35.0 DEVELOPER=1 regression (was: [PATCH] config.mak.dev: specify -std=gnu99 for gcc/clang) brian m. carlson
2022-01-14 12:01 ` Ævar Arnfjörð Bjarmason
2022-01-14 19:51 ` v2.35.0 DEVELOPER=1 regression Junio C Hamano
2022-01-14 20:41 ` Ævar Arnfjörð Bjarmason
2022-01-14 21:53 ` Junio C Hamano
2022-01-14 23:57 ` Junio C Hamano
2022-01-14 22:35 ` Junio C Hamano
2022-01-14 23:56 ` Ævar Arnfjörð Bjarmason
2022-01-15 0:31 ` Junio C Hamano
2022-01-15 0:41 ` Ævar Arnfjörð Bjarmason
2022-01-15 1:08 ` Junio C Hamano
2022-01-18 12:32 ` Johannes Schindelin
2022-01-18 15:17 ` Ævar Arnfjörð Bjarmason
2022-01-18 20:15 ` Junio C Hamano
2022-01-19 0:29 ` Ævar Arnfjörð Bjarmason
2022-01-19 1:02 ` Junio C Hamano
2022-01-19 1:05 ` Ævar Arnfjörð Bjarmason
2022-01-19 1:19 ` Junio C Hamano
2022-01-18 17:47 ` [PATCH] Makefile: FreeBSD cannot do C99-or-below build Junio C Hamano
2022-01-18 21:47 ` Neeraj Singh
2022-01-18 23:36 ` Ævar Arnfjörð Bjarmason
2022-01-19 0:22 ` Junio C Hamano
2022-01-18 15:14 ` [PATCH] config.mak.dev: fix DEVELOPER=1 on FreeBSD with -std=gnu99 Ævar Arnfjörð Bjarmason
2022-01-18 17:19 ` Junio C Hamano
2022-01-19 0:26 ` Ævar Arnfjörð Bjarmason
2021-12-08 14:35 ` [PATCH 10/10] reftable: make reftable_record a tagged union Derrick Stolee
2021-12-08 14:48 ` Han-Wen Nienhuys
2021-12-08 18:17 ` Derrick Stolee
2021-12-23 17:11 ` Han-Wen Nienhuys
2021-12-08 16:47 ` Junio C Hamano
2021-12-08 17:51 ` Han-Wen Nienhuys
2021-12-08 21:49 ` [PATCH v2 00/11] Reftable coverity fixes Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 01/11] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 02/11] reftable: fix resource leak in error path Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 03/11] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 04/11] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 05/11] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 06/11] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 07/11] reftable: fix NULL derefs in error paths Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 08/11] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 09/11] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 10/11] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2021-12-08 21:49 ` [PATCH v2 11/11] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2021-12-09 5:31 ` [PATCH v2 00/11] Reftable coverity fixes Jeff King
2021-12-13 16:01 ` [PATCH v3 " Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 01/11] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 02/11] reftable: fix resource leak in error path Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:19 ` Ævar Arnfjörð Bjarmason
2021-12-13 16:44 ` Han-Wen Nienhuys
2021-12-13 22:10 ` Junio C Hamano
2021-12-13 16:01 ` [PATCH v3 03/11] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 04/11] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 05/11] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 06/11] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 07/11] reftable: fix NULL derefs in error paths Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:24 ` Ævar Arnfjörð Bjarmason
2021-12-13 16:01 ` [PATCH v3 08/11] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:25 ` Ævar Arnfjörð Bjarmason
2021-12-13 16:45 ` Han-Wen Nienhuys
2021-12-13 22:13 ` Junio C Hamano
2021-12-13 16:01 ` [PATCH v3 09/11] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:26 ` Ævar Arnfjörð Bjarmason
2021-12-13 16:46 ` Han-Wen Nienhuys
2021-12-13 16:01 ` [PATCH v3 10/11] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2021-12-13 16:01 ` [PATCH v3 11/11] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 00/11] Reftable coverity fixes Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 01/11] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 02/11] reftable: fix resource leak in block.c error path Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 03/11] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 04/11] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 05/11] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 06/11] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 07/11] reftable: all xxx_free() functions accept NULL arguments Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 08/11] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 09/11] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 10/11] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2021-12-14 11:47 ` [PATCH v4 11/11] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 00/16] Reftable coverity fixes Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 01/16] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2021-12-22 22:51 ` Junio C Hamano
2021-12-23 15:58 ` Han-Wen Nienhuys
2021-12-22 18:56 ` [PATCH v5 02/16] reftable: fix resource leak in block.c error path Han-Wen Nienhuys via GitGitGadget
2021-12-22 22:51 ` Junio C Hamano
2021-12-23 17:04 ` Han-Wen Nienhuys
2021-12-24 4:16 ` Junio C Hamano
2022-01-12 11:58 ` Han-Wen Nienhuys
2022-01-12 14:03 ` René Scharfe
2022-01-13 18:52 ` Junio C Hamano
2022-01-13 9:55 ` Ævar Arnfjörð Bjarmason
2022-01-13 14:27 ` Han-Wen Nienhuys
2021-12-22 18:56 ` [PATCH v5 03/16] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 04/16] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 05/16] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 06/16] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 07/16] reftable: all xxx_free() functions accept NULL arguments Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 08/16] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 09/16] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 10/16] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2021-12-22 22:51 ` Junio C Hamano
2021-12-22 18:56 ` [PATCH v5 11/16] reftable: make reftable-record.h function signatures const correct Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 12/16] reftable: implement record equality generically Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 13/16] reftable: remove outdated file reftable.c Han-Wen Nienhuys via GitGitGadget
2021-12-22 22:51 ` Junio C Hamano
2021-12-24 16:53 ` Ævar Arnfjörð Bjarmason
2021-12-22 18:56 ` [PATCH v5 14/16] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 15/16] reftable: add print functions to the record types Han-Wen Nienhuys via GitGitGadget
2021-12-22 18:56 ` [PATCH v5 16/16] reftable: be more paranoid about 0-length memcpy calls Han-Wen Nienhuys via GitGitGadget
2021-12-22 22:50 ` Junio C Hamano
2021-12-23 9:49 ` René Scharfe
2021-12-23 18:59 ` Junio C Hamano
2021-12-26 20:51 ` René Scharfe
2021-12-26 21:07 ` Ævar Arnfjörð Bjarmason [this message]
2021-12-23 15:58 ` Han-Wen Nienhuys
2021-12-24 4:16 ` Junio C Hamano
2022-01-12 11:39 ` Han-Wen Nienhuys
2022-01-12 12:59 ` Han-Wen Nienhuys
2021-12-22 22:51 ` [PATCH v5 00/16] Reftable coverity fixes Junio C Hamano
2022-01-20 15:11 ` [PATCH v6 00/15] " Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 01/15] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2022-01-21 11:41 ` Ævar Arnfjörð Bjarmason
2022-01-24 14:14 ` Han-Wen Nienhuys
2022-01-20 15:12 ` [PATCH v6 02/15] reftable: fix resource leak in block.c error path Han-Wen Nienhuys via GitGitGadget
2022-01-21 11:42 ` Ævar Arnfjörð Bjarmason
2022-01-22 1:11 ` Junio C Hamano
2022-01-20 15:12 ` [PATCH v6 03/15] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 04/15] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2022-01-21 11:44 ` Ævar Arnfjörð Bjarmason
2022-01-20 15:12 ` [PATCH v6 05/15] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2022-01-21 11:46 ` Ævar Arnfjörð Bjarmason
2022-01-20 15:12 ` [PATCH v6 06/15] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 07/15] reftable: all xxx_free() functions accept NULL arguments Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 08/15] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 09/15] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 10/15] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 11/15] reftable: make reftable-record.h function signatures const correct Han-Wen Nienhuys via GitGitGadget
2022-01-20 15:12 ` [PATCH v6 12/15] reftable: implement record equality generically Han-Wen Nienhuys via GitGitGadget
2022-01-21 11:52 ` Ævar Arnfjörð Bjarmason
2022-01-20 15:12 ` [PATCH v6 13/15] reftable: remove outdated file reftable.c Han-Wen Nienhuys via GitGitGadget
2022-01-21 12:05 ` Ævar Arnfjörð Bjarmason
2022-01-20 15:12 ` [PATCH v6 14/15] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2022-01-21 12:06 ` Ævar Arnfjörð Bjarmason
2022-01-24 15:34 ` Han-Wen Nienhuys
2022-01-20 15:12 ` [PATCH v6 15/15] reftable: add print functions to the record types Han-Wen Nienhuys via GitGitGadget
2022-01-21 12:33 ` Ævar Arnfjörð Bjarmason
2022-01-24 15:50 ` Han-Wen Nienhuys
2022-01-24 19:13 ` [PATCH v7 00/16] Reftable coverity fixes Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 01/16] reftable: fix OOB stack write in print functions Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:24 ` Ævar Arnfjörð Bjarmason
2022-01-24 19:13 ` [PATCH v7 02/16] reftable: fix resource leak in block.c error path Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 03/16] reftable: fix resource leak blocksource.c Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 04/16] reftable: check reftable_stack_auto_compact() return value Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 05/16] reftable: ignore remove() return value in stack_test.c Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 06/16] reftable: fix resource warning Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 07/16] reftable: all xxx_free() functions accept NULL arguments Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 08/16] reftable: order unittests by complexity Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 09/16] reftable: drop stray printf in readwrite_test Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 10/16] reftable: handle null refnames in reftable_ref_record_equal Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 11/16] reftable: make reftable-record.h function signatures const correct Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 12/16] reftable: implement record equality generically Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 13/16] reftable: remove outdated file reftable.c Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 14/16] reftable: make reftable_record a tagged union Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:39 ` Ævar Arnfjörð Bjarmason
2022-01-24 19:53 ` Han-Wen Nienhuys
2022-01-24 21:54 ` Ævar Arnfjörð Bjarmason
2022-02-19 12:54 ` master doesn't compile on xlc 21.01 anymore (old AIX compiler) (was: [PATCH v7 14/16] reftable: make reftable_record a tagged union) Ævar Arnfjörð Bjarmason
2022-02-19 15:11 ` René Scharfe
2022-03-28 19:10 ` [PATCH] reftable: make assignments portable to AIX xlc v12.01 Ævar Arnfjörð Bjarmason
2022-03-28 20:57 ` Junio C Hamano
2022-03-29 12:12 ` Han-Wen Nienhuys
2022-03-29 15:59 ` Junio C Hamano
2022-01-24 19:13 ` [PATCH v7 15/16] reftable: add print functions to the record types Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:13 ` [PATCH v7 16/16] reftable: rename typ to type Han-Wen Nienhuys via GitGitGadget
2022-01-24 19:48 ` [PATCH v7 00/16] Reftable coverity fixes Ævar Arnfjörð Bjarmason
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as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).