From: Guus Sliepen <guus@meshlink.io>
Date: Wed, 27 May 2020 19:09:00 +0000 (+0200)
Subject: Fix reception of a trailing, zero-length frame.
X-Git-Url: http://git.meshlink.io/?a=commitdiff_plain;ds=sidebyside;h=933047eadd101bddb3646ad7acbc0e48170049a0;p=meshlink

Fix reception of a trailing, zero-length frame.

If the last (or only) frame received on a framed UDP channel had zero length,
we would not send it to the application, but keep it in the receive buffer
until more frames had been received.
---

diff --git a/src/utcp.c b/src/utcp.c
index d068d45b..00e02f6e 100644
--- a/src/utcp.c
+++ b/src/utcp.c
@@ -1444,11 +1444,11 @@ static void handle_unreliable_framed(struct utcp_connection *c, const struct hdr
 	buffer_clear(&c->rcvbuf);
 
 	// Handle whole frames
-	while(left > 2) {
+	while(left >= 2) {
 		uint16_t framelen;
 		memcpy(&framelen, ptr, sizeof(framelen));
 
-		if(left <= (size_t)framelen + 2) {
+		if(left < (size_t)framelen + 2) {
 			break;
 		}