git.c: guard config parser from value=NULL

alias.* configuration expects a string value

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git.c b/git.c
index 15fec8974ad5361a2308b3c46424e896bc8e3246..0cb86884d738a8314f164c82e4cc619a9998f3db 100644 (file)
--- a/git.c
+++ b/git.c
@@ -93,6 +93,8 @@ static char *alias_string;
 static int git_alias_config(const char *var, const char *value)
 {
        if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
+               if (!value)
+                       return config_error_nonbool(var);
                alias_string = xstrdup(value);
        }
        return 0;