From d51be32362f49a53d4c186f8da06a317b8dad21b Mon Sep 17 00:00:00 2001
From: wu-changsheng <wuchangsheng2@huawei.com>
Date: Wed, 16 Nov 2022 20:04:01 +0800
Subject: [PATCH] fix pcb snd_buf flip

---
 src/lstack/core/lstack_lwip.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/lstack/core/lstack_lwip.c b/src/lstack/core/lstack_lwip.c
index 196420d..8a11aa5 100644
--- a/src/lstack/core/lstack_lwip.c
+++ b/src/lstack/core/lstack_lwip.c
@@ -227,6 +227,11 @@ struct pbuf *write_lwip_data(struct lwip_sock *sock, uint16_t remain_size, uint8
         return NULL;
     }
 
+    if (pbuf->tot_len > remain_size) {
+        *apiflags &= ~TCP_WRITE_FLAG_MORE;
+        return NULL;
+    }
+
     return pbuf;
 }
 
-- 
2.33.0