Merge branch 'jk/implicit-true'

Some codepaths did not correctly parse configuration variables
specified with valueless "true", which has been corrected.

* jk/implicit-true:
  fsck: handle NULL value when parsing message config
  trailer: handle NULL value when parsing trailer-specific config
  submodule: handle NULL value when parsing submodule.*.branch
  help: handle NULL value for alias.* config
  trace2: handle NULL values in tr2_sysenv config callback
  setup: handle NULL value when parsing extensions
  config: handle NULL value when parsing non-bools

1 files changed, 4 insertions, 1 deletions

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;
 }