diff --git a/system/nxinit/Kconfig b/system/nxinit/Kconfig
index 3cd256bf7..29aa691c8 100644
--- a/system/nxinit/Kconfig
+++ b/system/nxinit/Kconfig
@@ -40,6 +40,7 @@ config SYSTEM_NXINIT_RC_FILE_PATH
 config SYSTEM_NXINIT_RC_LINE_MAX
 	int "Max line length of RC file"
 	default 128
+	range 64 4096
 	---help---
 		Maximum line length of RC file.
 		More details: https://android.googlesource.com/platform/system/core/+/master/init/README.md
diff --git a/system/nxinit/parser.c b/system/nxinit/parser.c
index 664876b5a..c05f28917 100644
--- a/system/nxinit/parser.c
+++ b/system/nxinit/parser.c
@@ -109,7 +109,7 @@ static int init_parse_config_buffer(FAR const struct parser_s *parser,
 
   for (; ; )
     {
-      r = MIN(len - off, sizeof(tmp));
+      r = MIN(len - off, sizeof(tmp) - n);
       memcpy(&tmp[n], &buf[off], r);
       if (r == 0)
         {