From 89086c9466624ca0b53f04374e293a7afcec592b Mon Sep 17 00:00:00 2001 From: Jeff King Date: Thu, 7 Dec 2023 02:11:27 -0500 Subject: [PATCH] help: handle NULL value for alias.* config When showing all config with "git help --all", we print the list of defined aliases. But our config callback to do so does not check for a NULL value, meaning a config block like: [alias] foo will cause us to segfault. We should detect and complain about this in the usual way. Since this command is purely informational (and we aren't trying to run the alias), we could perhaps just generate a warning and continue. But this sort of misconfiguration should be pretty rare, and the error message we will produce points directly to the line of config that needs to be fixed. So just generating the usual error should be OK. Signed-off-by: Jeff King Signed-off-by: Junio C Hamano --- help.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/help.c b/help.c index 6d2ebfbd2a..2dbe57b413 100644 --- a/help.c +++ b/help.c @@ -464,8 +464,11 @@ static int get_alias(const char *var, const char *value, { struct string_list *list = data; - if (skip_prefix(var, "alias.", &var)) + if (skip_prefix(var, "alias.", &var)) { + if (!value) + return config_error_nonbool(var); string_list_append(list, var)->util = xstrdup(value); + } return 0; }