From b52f2e0ca7069886bf322b9107279562b3f56551 Mon Sep 17 00:00:00 2001
From: Alistair Buxton <a.j.buxton@gmail.com>
Date: Wed, 6 Feb 2013 22:12:42 +0000
Subject: [PATCH] Bail out of packet eater if less than 4 bytes available.

Without this, packlen will be initialized with undefined data. This
causes "oversize packet" errors.
---
 src/micro/uSynergy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/micro/uSynergy.c b/src/micro/uSynergy.c
index a8d01da4..ffdf504c 100644
--- a/src/micro/uSynergy.c
+++ b/src/micro/uSynergy.c
@@ -514,6 +514,10 @@ static void sUpdateContext(uSynergyContext *context)
 	/* Eat packets */
 	for (;;)
 	{
+		/* If less than 4 bytes left in buffer, we can't even get the next packet length yet */
+		if(context->m_receiveOfs < 4)
+			return;
+
 		/* Grab packet length and bail out if the packet goes beyond the end of the buffer */
 		packlen = sNetToNative32(context->m_receiveBuffer);
 		if (packlen+4 > context->m_receiveOfs)