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From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>,
	"Derrick Stolee" <stolee@gmail.com>,
	"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH v2 13/14] upload-pack: fix a memory leak in create_pack_file()
Date: Wed, 20 Jul 2022 23:21:51 +0200	[thread overview]
Message-ID: <patch-v2-13.14-07b6572aea9-20220720T211221Z-avarab@gmail.com> (raw)
In-Reply-To: <cover-v2-00.14-00000000000-20220720T211221Z-avarab@gmail.com>

Fix a memory leak that's been reported by some versions of "gcc" since
"output_state" became malloc'd in 55a9651d26a (upload-pack.c: increase
output buffer size, 2021-12-14).

In e75d2f7f734 (revisions API: have release_revisions() release
"filter", 2022-04-13) it was correctly marked as leak-free, the only
path through this function that doesn't reach the free(output_state)
is if we "goto fail", and that will invoke "die()".

Such leaks are not included with SANITIZE=leak (but e.g. valgrind will
still report them), but under some gcc optimization (I have not been
able to reproduce it with "clang") we'll report a leak here
anyway. E.g. gcc v12 with "-O2" and above will trigger it, but not
clang v13 with any "-On".

The GitHub CI would also run into this leak if the "linux-leaks" job
was made to run with "GIT_TEST_SANITIZE_LEAK_LOG=true".

See [1] for a past case where gcc had similar trouble analyzing leaks
involving a die() invocation in the function.

1. https://lore.kernel.org/git/patch-v3-5.6-9a44204c4c9-20211022T175227Z-avarab@gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 t/t1060-object-corruption.sh | 1 +
 upload-pack.c                | 1 +
 2 files changed, 2 insertions(+)

diff --git a/t/t1060-object-corruption.sh b/t/t1060-object-corruption.sh
index e8a58b15897..5b8e47e346c 100755
--- a/t/t1060-object-corruption.sh
+++ b/t/t1060-object-corruption.sh
@@ -2,6 +2,7 @@
 
 test_description='see how we handle various forms of corruption'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # convert "1234abcd" to ".git/objects/12/34abcd"
diff --git a/upload-pack.c b/upload-pack.c
index 3a851b36066..b3884d3f4de 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -455,6 +455,7 @@ static void create_pack_file(struct upload_pack_data *pack_data,
 	return;
 
  fail:
+	free(output_state);
 	send_client_data(3, abort_msg, sizeof(abort_msg),
 			 pack_data->use_sideband);
 	die("git upload-pack: %s", abort_msg);
-- 
2.37.1.1064.gc96144cf387


  parent reply	other threads:[~2022-07-20 21:23 UTC|newest]

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-19 21:05 [PATCH 00/10] leak test: add "check" test mode, mark leak-free tests Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 01/10] test-lib.sh: use $1, not $@ in test_known_broken_{ok,failure}_ Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 02/10] test-lib.sh: don't set GIT_EXIT_OK before calling test_atexit_handler Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 03/10] test-lib.sh: fix GIT_EXIT_OK logic errors, use BAIL_OUT Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 04/10] test-lib.sh: add a --invert-exit-code switch Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 05/10] t/README: reword the "GIT_TEST_PASSING_SANITIZE_LEAK" description Ævar Arnfjörð Bjarmason
2022-07-20  1:38   ` Derrick Stolee
2022-07-19 21:05 ` [PATCH 06/10] test-lib: add a SANITIZE=leak logging mode Ævar Arnfjörð Bjarmason
2022-07-19 21:05 ` [PATCH 07/10] test-lib.sh: add a GIT_TEST_PASSING_SANITIZE_LEAK=check mode Ævar Arnfjörð Bjarmason
2022-07-20  1:43   ` Derrick Stolee
2022-07-19 21:05 ` [PATCH 08/10] test-lib: have the "check" mode for SANITIZE=leak consider leak logs Ævar Arnfjörð Bjarmason
2022-07-20  1:47   ` Derrick Stolee
2022-07-19 21:05 ` [PATCH 09/10] leak tests: mark passing SANITIZE=leak tests as leak-free Ævar Arnfjörð Bjarmason
2022-07-20  1:50   ` Derrick Stolee
2022-07-19 21:05 ` [PATCH 10/10] log tests: don't use "exit 1" outside a sub-shell Ævar Arnfjörð Bjarmason
2022-07-20 17:11   ` Junio C Hamano
2022-07-20 21:21 ` [PATCH v2 00/14] leak test: add "check" test mode, mark leak-free tests Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 01/14] test-lib: use $1, not $@ in test_known_broken_{ok,failure}_ Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 02/14] test-lib: don't set GIT_EXIT_OK before calling test_atexit_handler Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 03/14] test-lib: fix GIT_EXIT_OK logic errors, use BAIL_OUT Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 04/14] test-lib: add a --invert-exit-code switch Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 05/14] t/README: reword the "GIT_TEST_PASSING_SANITIZE_LEAK" description Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 06/14] test-lib: add a SANITIZE=leak logging mode Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 07/14] t/Makefile: don't remove test-results in "clean-except-prove-cache" Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 08/14] tests: move copy/pasted PERL + Test::More checks to a lib-perl.sh Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 09/14] test-lib: simplify by removing test_external Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 10/14] test-lib: add a GIT_TEST_PASSING_SANITIZE_LEAK=check mode Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 11/14] test-lib: have the "check" mode for SANITIZE=leak consider leak logs Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` [PATCH v2 12/14] leak tests: mark passing SANITIZE=leak tests as leak-free Ævar Arnfjörð Bjarmason
2022-07-20 21:21   ` Ævar Arnfjörð Bjarmason [this message]
2022-07-20 21:21   ` [PATCH v2 14/14] CI: use "GIT_TEST_SANITIZE_LEAK_LOG=true" in linux-leaks Ævar Arnfjörð Bjarmason
2022-07-27 23:13   ` [PATCH v3 00/15] leak test: add "check" test mode, mark leak-free tests Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 01/15] test-lib: use $1, not $@ in test_known_broken_{ok,failure}_ Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 02/15] test-lib: don't set GIT_EXIT_OK before calling test_atexit_handler Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 03/15] test-lib: fix GIT_EXIT_OK logic errors, use BAIL_OUT Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 04/15] test-lib: add a --invert-exit-code switch Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 05/15] t/README: reword the "GIT_TEST_PASSING_SANITIZE_LEAK" description Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 06/15] test-lib: add a SANITIZE=leak logging mode Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 07/15] t/Makefile: don't remove test-results in "clean-except-prove-cache" Ævar Arnfjörð Bjarmason
2022-09-20 10:54       ` [PATCH] t/Makefile: remove 'test-results' on 'make clean' SZEDER Gábor
2022-09-20 19:51         ` Jeff King
2022-09-20 20:11           ` SZEDER Gábor
2022-09-20 20:42             ` Jeff King
2022-09-20 20:16         ` [PATCH v2] " SZEDER Gábor
2022-09-21  6:59           ` Ævar Arnfjörð Bjarmason
2022-09-21 17:49             ` Junio C Hamano
2022-09-21 17:52           ` Junio C Hamano
2022-09-26  9:08             ` Ævar Arnfjörð Bjarmason
2022-09-26 19:08               ` Junio C Hamano
2022-07-27 23:13     ` [PATCH v3 08/15] tests: move copy/pasted PERL + Test::More checks to a lib-perl.sh Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 09/15] test-lib: simplify by removing test_external Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 10/15] test-lib: add a GIT_TEST_PASSING_SANITIZE_LEAK=check mode Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 11/15] test-lib: have the "check" mode for SANITIZE=leak consider leak logs Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 12/15] leak tests: don't skip some tests under SANITIZE=leak Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 13/15] leak tests: mark passing SANITIZE=leak tests as leak-free Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 14/15] upload-pack: fix a memory leak in create_pack_file() Ævar Arnfjörð Bjarmason
2022-07-27 23:13     ` [PATCH v3 15/15] CI: use "GIT_TEST_SANITIZE_LEAK_LOG=true" in linux-leaks Ævar Arnfjörð Bjarmason

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