[PATCH v2] multi-pack-index: fix potential segfault without sub-command
- From
Taylor Blau <me@ttaylorr.com>
- Date
- Jul 21, 2021, 16:52 UTC
- Message-ID
- <12804130427fd71e88ce10aed283c1f9cdd330ef.1626886330.git.me@ttaylorr.com>
- In-Reply-To
- <YPfWkzRtQKthOgZx@coredump.intra.peff.net>
Since cd57bc41bb (builtin/multi-pack-index.c: display usage on unrecognized command, 2021-03-30) we have used a "usage" label to avoid having two separate callers of usage_with_options (one when no arguments are given, and another for unrecognized sub-commands).
But the first caller has been broken since cd57bc41bb, since it will happily jump to usage without arguments, and then pass argv[0] to the "unrecognized subcommand" error.
Many compilers will save us from a segfault here, but the end result is ugly, since it mentions an unrecognized subcommand when we didn't even pass one, and (on GCC) includes "(null)" in its output.
Move the "usage" label down past the error about unrecognized subcommands so that it is only triggered when it should be. While we're at it, bulk up our test coverage in this area, too.
Signed-off-by: Taylor Blau <me@ttaylorr.com> --- I didn't realize that we are veering away from test_i18ngrep in new tests, so here's a version of this trivial patch with grep instead.
Range-diff against v1:
1: 8c0bb3e0dc ! 1: 1280413042 multi-pack-index: fix potential segfault without sub-command
@@ t/t5319-multi-pack-index.sh: test_expect_success 'load reverse index when missin +test_expect_success 'usage shown without sub-command' '
+ test_expect_code 129 git multi-pack-index 2>err &&
-+ ! test_i18ngrep "unrecognized subcommand" err
++ ! grep "unrecognized subcommand" err
+'
+
test_donebuiltin/multi-pack-index.c | 2 +- t/t5319-multi-pack-index.sh | 5 +++++ 2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/builtin/multi-pack-index.c b/builtin/multi-pack-index.c index 5d3ea445fd..8ff0dee2ec 100644 --- a/builtin/multi-pack-index.c +++ b/builtin/multi-pack-index.c @@ -176,8 +176,8 @@ int cmd_multi_pack_index(int argc, const char **argv, else if (!strcmp(argv[0], "expire")) return cmd_multi_pack_index_expire(argc, argv); else { -usage: error(_("unrecognized subcommand: %s"), argv[0]); +usage: usage_with_options(builtin_multi_pack_index_usage, builtin_multi_pack_index_options); } diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh index 7609f1ea64..c0ec5a6fd3 100755 --- a/t/t5319-multi-pack-index.sh +++ b/t/t5319-multi-pack-index.sh @@ -837,4 +837,9 @@ test_expect_success 'load reverse index when missing .idx, .pack' ' ) ' +test_expect_success 'usage shown without sub-command' ' + test_expect_code 129 git multi-pack-index 2>err && + ! grep "unrecognized subcommand" err +' + test_done -- 2.31.1.163.ga65ce7f831