From d2308d41d75033e9027e466eff126696cd921523 Mon Sep 17 00:00:00 2001
From: Mengxi-Xu <109797814+Mengxi-Xu@users.noreply.github.com>
Date: Mon, 5 Jun 2023 01:50:04 +0800
Subject: [PATCH] [components] [fdt] add parameter check

---
 components/drivers/fdt/libfdt/fdt_rw.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/components/drivers/fdt/libfdt/fdt_rw.c b/components/drivers/fdt/libfdt/fdt_rw.c
index 74954c2f28..58827ef898 100644
--- a/components/drivers/fdt/libfdt/fdt_rw.c
+++ b/components/drivers/fdt/libfdt/fdt_rw.c
@@ -96,7 +96,9 @@ static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen)
 {
     char *p = splicepoint;
     char *end = (char *)fdt + _fdt_data_size(fdt);
-
+    
+    if (oldlen <= 0)
+        return -FDT_ERR_BADOFFSET;
     if (((p + oldlen) < p) || ((p + oldlen) > end))
         return -FDT_ERR_BADOFFSET;
     if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt))