From 69667e2c73c84b1b022a59ab9eca6f1afe987a6e Mon Sep 17 00:00:00 2001
From: zhanghongyu <zhanghongyu@xiaomi.com>
Date: Sun, 23 Apr 2023 10:47:02 +0800
Subject: [PATCH] iob: iob_clone_partial support Negative offset

make the function can correctly handle negative offset cases

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
---
 mm/iob/iob_clone.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/iob/iob_clone.c b/mm/iob/iob_clone.c
index 9f34221e6f..109e3d6bd8 100644
--- a/mm/iob/iob_clone.c
+++ b/mm/iob/iob_clone.c
@@ -140,7 +140,7 @@ int iob_clone_partial(FAR struct iob_s *iob1, unsigned int len,
   while (iob2 != NULL)
     {
       avail2 = CONFIG_IOB_BUFSIZE - iob2->io_offset;
-      if (offset2 < avail2)
+      if ((int)(offset2 - avail2) < 0)
         {
           break;
         }