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set_git_dir: fix crash when used with real_path()

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`real_path()` returns result from a shared buffer, inviting subtle
reentrance bugs. One of these bugs occur when invoked this way:
    set_git_dir(real_path(git_dir))

In this case, `real_path()` has reentrance:
    real_path
    read_gitfile_gently
    repo_set_gitdir
    setup_git_env
    set_git_dir_1
    set_git_dir

Later, `set_git_dir()` uses its now-dead parameter:
    !is_absolute_path(path)

Fix this by using a dedicated `strbuf` to hold `strbuf_realpath()`.

Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Alexandr Miloslavskiy
2020-03-06 19:03:13 +00:00
committed by Junio C Hamano
parent 076cbdcd73
commit 0915a5b4cd
5 changed files with 23 additions and 14 deletions
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4
builtin/init-db.c
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@ -356,12 +356,12 @@ int init_db(const char *git_dir, const char *real_git_dir,
if (!exist_ok && !stat(real_git_dir, &st))
die(_("%s already exists"), real_git_dir);
set_git_dir(real_path(real_git_dir));
set_git_dir(real_git_dir, 1);
git_dir = get_git_dir();
separate_git_dir(git_dir, original_git_dir);
}
else {
set_git_dir(real_path(git_dir));
set_git_dir(git_dir, 1);
git_dir = get_git_dir();
}
startup_info->have_repository = 1;