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config.c: NULL check when reading protected config 

In read_protected_config(), check whether each file name is NULL before
attempting to read it, and add a BUG() call to
git_config_from_file_with_options() to make this error easier to catch
in the future.

The NULL checks mirror what do_git_config_sequence() does (which
read_protected_config() is modeled after). Without these NULL checks,
multiple tests fail with "make SANITIZE=address", e.g. in the final test
of t4010, xdg_config is NULL causing us to call fopen(NULL).

Reported-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Glen Choo 2022-07-26 22:21:06 +00:00 committed by Junio C Hamano
parent 8d1a744820
commit 776f184893
1 changed files with 8 additions and 3 deletions
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11
config.c
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@ -1979,6 +1979,8 @@ int git_config_from_file_with_options(config_fn_t fn, const char *filename,
int ret = -1;
FILE *f;
if (!filename)
BUG("filename cannot be NULL");
f = fopen_or_warn(filename, "r");
if (f) {
ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
@ -2645,9 +2647,12 @@ static void read_protected_config(void)
system_config = git_system_config();
git_global_config(&user_config, &xdg_config);
git_configset_add_file(&protected_config, system_config);
git_configset_add_file(&protected_config, xdg_config);
git_configset_add_file(&protected_config, user_config);
if (system_config)
git_configset_add_file(&protected_config, system_config);
if (xdg_config)
git_configset_add_file(&protected_config, xdg_config);
if (user_config)
git_configset_add_file(&protected_config, user_config);
git_configset_add_parameters(&protected_config);
free(system_config);