kconfig: Avoid buffer underrun in choice input

[karo-tx-linux.git] / scripts / kconfig / conf.c

diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c
index 659326c3e89579b09f86077dbcbe5e1eb3a12d28..006ad817cd5f003023a7308b471eb9c4e46ba5de 100644 (file)
--- a/scripts/kconfig/conf.c
+++ b/scripts/kconfig/conf.c
@@ -332,7 +332,7 @@ static int conf_choice(struct menu *menu)
                }
                if (!child)
                        continue;
-               if (line[strlen(line) - 1] == '?') {
+               if (line[0] && line[strlen(line) - 1] == '?') {
                        print_help(child);
                        continue;
                }