From ec8bf5c8c12e1784e619b090b87ca567b199ec71 Mon Sep 17 00:00:00 2001
From: Masayuki Ishikawa <masayuki.ishikawa@gmail.com>
Date: Fri, 29 Jan 2021 13:34:52 +0900
Subject: [PATCH] net: tcp: Add DEBUGASSERT() in psock_tcp_send()

Summary:
- This commit adds DEBUGASSERT() to check the IOB size

Impact:
- None

Testing:
- Tested with sabre-6quad:netnsh with QEMU

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
---
 net/tcp/tcp_send_buffered.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/tcp/tcp_send_buffered.c b/net/tcp/tcp_send_buffered.c
index 51c36a6ef67..f99c7487e18 100644
--- a/net/tcp/tcp_send_buffered.c
+++ b/net/tcp/tcp_send_buffered.c
@@ -1144,6 +1144,11 @@ ssize_t psock_tcp_send(FAR struct socket *psock, FAR const void *buf,
            */
 
           blresult = net_breaklock(&count);
+
+          /* NOTE: At least IOB needs to hold the packet */
+
+          DEBUGASSERT((CONFIG_IOB_NBUFFERS * CONFIG_IOB_BUFSIZE) > len);
+
           result = TCP_WBCOPYIN(wrb, (FAR uint8_t *)buf, len);
           if (blresult >= 0)
             {