From 4ad158fac6d70541cdaf8d14a629bb2ddd813637 Mon Sep 17 00:00:00 2001
From: Armin Novak <armin.novak@thincast.com>
Date: Wed, 4 Mar 2020 14:23:17 +0100
Subject: [PATCH] Added freerdp_channels_data argument checks.

---
 libfreerdp/core/client.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libfreerdp/core/client.c b/libfreerdp/core/client.c
index f54f6eb6c..09b0af87c 100644
--- a/libfreerdp/core/client.c
+++ b/libfreerdp/core/client.c
@@ -427,6 +427,14 @@ int freerdp_channels_data(freerdp* instance, UINT16 channelId, BYTE* data, int d
 	rdpChannels* channels;
 	rdpMcsChannel* channel = NULL;
 	CHANNEL_OPEN_DATA* pChannelOpenData;
+
+	if (!instance || !data || (dataSize < 0) || (totalSize < 0))
+	{
+		WLog_ERR(TAG, "%s(%p, %" PRIu16 ", %p, %d, 0x%08x, %d): Invalid arguments", __FUNCTION__,
+		         instance, channelId, data, dataSize, flags, totalSize);
+		return -1;
+	}
+
 	mcs = instance->context->rdp->mcs;
 	channels = instance->context->channels;